GM made a rubber one for them, but I've never heard of them included as stock equipment. You see them from time to time on Marketplace and eBay.
https://www.ebay.com/itm/16809720157...Bk9SR9qv9oSGZw
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2010 SS - Kind of an On3 kit, CTR 78/80, CompCam 239/251 620/632 122+4, E85, Z28 suspension and ZL1 diff with Outlaw axles. Gen6 ZL1 brakes.
2011 Vert - 416/w 230/236 .612/.602 115lsa, 1LE suspension w/32mm rear bar. Z28 diff. Gen6 ZL1 brakes.
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