Dear customer,
Thank you for your question.
The only difference between the Tensioner pulley 310T0129 RIDEX and Deflection / Guide Pulley, v-ribbed belt- 312D0083 RIDEX have different bearings:
- Tensioner pulley 310T0129 RIDEX has bearing 6203RS with inner diameter 17mm.
- Deflection / Guide Pulley, v-ribbed belt- 312D0083 RIDEX has bearing 6203LHA-X but there is no information about its inner diameter.
To help you to check suitable car parts for your vehicle, we kindly ask you to provide us with the VIN code / chassis number (17 letters+digits) or the original part numbers (OEM) of the required car parts.
If you have any questions, feel free to contact us.
Best regards,
the 123spareparts.co.uk team