Brand new Rear Anti Roll Bar Collar for Rover 200 (up to 1996) / 400 (all years) / 600 (all years) / 45 / ZS (all years). 
This fits in the Rear Anti Roll Bar Bush which connects the ARB to the drop link - see attached illustration. 

These are made to the OE specification from lightweight machined alloy by us in our workshop - at a fraction of the usual RRP!

Priced as a pair - see our other listings for individual items.