I don't know where you got your original replacement bushings, but I got mine for the 108 right here at PartsShop. The bushings came with all new mounting hardware, including center bolts, good thing too as mine had just about worn through 1/4 of the diameter from rubbing on the inner metal cone (see pics in the DIY section).
'73 280SEL 4.5 (9/72)- RIP
Only 8,173 units built from 5/71 thru 11/72
'02 CLK320 Cabriolet - wifey's mid-life crisis
2012 VW Jetta Sportwagon TDI...at least its a diesel
Non illegitemae carborundum.