The lens number is usually moulded into the lens, and includes the manufacturers name as well as a number, e.g. Koito 123456 or Bosch 123456.
Where do I find part information?
Indicators sometimes have clear lenses and coloured bulbs, so tell the supplier if the indicator is clear, orange, yellow or combinations thereof.
Many panels and other parts differ for a 3 door or 5 door vehicle so it is important that the supplier knows which it is.
When requesting wheels, include the number of wheel studs (count the wheel nuts) to ensure the supplier can quote one that fits.
Most models with airbags are pretensioner type. To be sure, you can remove the centre pillar trim and look for a pressure canister attached to the seatbelt mechanism.
Number of wires relates to the control features and functions of the mirror. The more wires, the more functions and features your mirror is likely to have. In addition to the typical rotation features of your mirror, there could be demist or heating functions. You can ascertain the number of wires by removing the mirror or inner door trim of the vehicle behind where the mirror is fixed to the door.
The trans code or transmission code is often on the ID or VIN plate under the bonnet of the vehicle. Sometimes the supplier will require numbers that are stamped on the transmission housing and this more often than not, can only be obtained when the transmission has been removed. The key is to provide as much information about the vehicle such as the vehicle ID numbers off the VIN or ID plate, or simply use the BVI look up service and enter the rego when submitting a quote request.