zroadster.net

Original BMW part in "sort of good condition" for cheap (a brand new bushing looks pretty much the same, the only real upgrade would be a polybushing)

It comes from 1.9 103kw with a small 25% LSD. Probably compatible with E30 as well.

http://www.ebay.co.uk/itm/172285627368

Free shipping & Quick delivery within Europe

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If I am being honest, I cannot see anyone buying a secondhand bush to fit to their car, they are a little tricky to get in/out and it is the sort of job you will only want to do once.