They sell different size shims in the fast lane store. That would be even better than a rubber but do something similar. BTW that is probably a lot more cost effective than buying an after market camber bolt set. Which run about 400.

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My Daily : 96 E-300 Diesel with 195,000 miles
Retired: 92 300D 2.5 T 345K miles and for sale
Retired: 95 E320 157K miles and currently parked with blown engine

Both retired cars are for sale as is my w124 shop inventory