I found I was replacing them constantly on my MK1 at the race track.

I tried OEM, OEM HD, OEM upgrade for Cat equipped cars, everything on the shelf at repco, supercheap etc.

Eventually I upgraded to these.

Bahn Brenner Motorsport - Exhaust Hanger w/ Chain Insert

They're a stock replacement with a length of small bicycle chain cast into the rubber.

No problems since.

Pete