Lower Idler Assembly 1983 to 1987 & 1990 to 1995 has a single roller – see picture below
Lower Idler Assembly 1987 to 1990 has a double roller – see picture.
This assembly is expensive at circa $250. Far better to press out the bearing in the roller and replace with a new one.
Complete Assembly Part Numbers are —-
Lower Idler Assembly 83 to 87 – 90 to 95 – Single Roller 928 105 067 00
Lower Idler Assembly 87 to 90 – Double Roller 928 105 067 01
If you require the Circlip & Washer that hold the assembly to the block parts numbers are –
Fit Washer for Lower Idler Assy. – (was 900 234 003 02) is 900 234 003 01
Circlip – 8 x 0.8 – N 012 408 2