My '91 535i has just had all suspension replaced
at 192K miles. Bought new Meyle upper and lower control arms, etc. The new upper thrust arms came with 750il bushings and I pressed 'em out and into the trash, pressed in new Grunt bushings. They are great. Also, just installed new Bilstein HDs all around. I like a firm ride, but not too harsh. The report on Grunts are very positive and I have not heard of any failures either. Also, they are easier to install, no pre-loading the suspension to worry about.
I think you will like them. I have has the 750 bushings and they fail too soon for my liking. I think the Grunts will last longer and Paul is good to buy from. Cheers.
Keith in Scottsdale, AZ
'91 535ia 220K Alpine/Parchment
'89 735il 252K Cirrus/Parchment
'00 740il 124K Oxford/Sand