A rear lamp can match the space on your truck and still need different wiring, a different resistor or a different product reference. Start with the vehicle and the exact lamp, then choose the appearance. This keeps a useful shortlist from becoming an expensive assumption.
Use Find lighting to explore the range. When you have a candidate, use the vehicle fitment check to examine the published combinations and their conditions.
1. Identify the truck before selecting the lamp
Record the manufacturer, model, production year and month, and whether the vehicle is a heavy truck, tractor, medium truck or small truck. Add the model code when known. A familiar model name is not enough: the manufacturer’s records separate original incandescent lamps from factory LED lamps, and some applications distinguish connector types or particular model codes.
Use the vehicle’s documentation and the actual installation. If you cannot confirm a detail, leave it unknown. A clear question is more useful than a plausible guess.
Swipe or use the arrow keys to see all columns.
| Detail to collect | What to record |
|---|---|
| Vehicle | Manufacturer, model, type and model code |
| Production | Year and month, where known |
| Electrical system | Confirmed supply voltage |
| Original rear lamps | Incandescent, factory LED or unknown |
| Connections | Connector photographs and any previous modifications |
| Vehicle functions | Whether optional emergency stop signalling is fitted |
2. Treat voltage as a reference-level specification
Do not select voltage from the truck’s size or from a photograph. Check the vehicle supply and the exact lamp reference.
TSURUGI shows why the family name alone is insufficient. OIRAN specifies the long OCTR-CRC-LO1 model for 24V. The short OCTR-CRC-SH1 and short non-indicator OCTR-CRC-SH1-C models are specified for 12V/24V. The last of these has no turn-signal function. These differences cannot be resolved by choosing the same lens appearance. Manufacturer specifications.
3. Check the complete physical installation
Measure the available space and compare the product’s stated dimensions, mounting arrangement and connector clearance. Include the surrounding bodywork and anything that could interfere with the rear of the lamp.
A matching width does not establish mounting compatibility. Likewise, a slim lamp shown on a demonstration truck does not document every possible mounting arrangement. Use the instructions for the chosen reference rather than copying the position from a campaign photograph.
4. Choose the functions you actually need
Make a short list: position light, brake light, turn signal, reverse light and any other required functions. Check each against the exact reference.
Sequential turn signals, unlock/lock animation and starting/ending animation are different functions. A product supporting one does not automatically support the others. Emergency Stop Signal compatibility also depends on the product and vehicle. The lighting-function glossary explains what to ask before choosing a mode.
5. Read the lamp, harness and resistor together
A manufacturer fitment result describes a combination. Read the lamp reference, associated accessories, quantities and notes as one record. Do not collect a lamp from one vehicle result and a harness from another simply because their photographs look similar.
The harness and resistor pages help identify the product families. The applicable vehicle-specific result determines which published reference needs checking for your installation. Additional wiring or vehicle-system work may still be required.
For a worked comparison of references and quantities, read How to read an OIRAN vehicle fitment result.
6. Keep unknown and pending results open
An absent result does not mean “incompatible”, and a family appearing in a list does not mean installation is confirmed. Some manufacturer entries are still under verification; some source pages are incomplete. Those results are reasons to request clarification, not invitations to choose the nearest listed kit.
Historical compatibility tables remain useful for their exact references and periods. They should not approve a newer lamp revision or override a current vehicle-specific condition.
7. Send a shortlist that can be checked
Before ordering, collect the exact lamp reference and finish, your vehicle details, connector photographs, the proposed accessory references and your country. Ask the supplier to confirm the sales unit, current availability, installation requirements and applicable product documentation.
Use Contact OIRAN JAPAN to prepare an editable distributor request. Review the text before opening your email application, copying it or downloading it. Preparing the request does not send it.
Start with a documented vehicle, finish with a documented combination—and choose the visual signature within those confirmed options.