weld plates: these are panel thickness specific
http://www.summitracing.com/search/Brand/S...s/?autoview=SKU
fasteners: these are shank length 0.500 in and 0.0550 in
http://www.summitracing.com/search/Brand/S...s/?autoview=SKU
if anyone has used these please tell me what thickness is should order for s chassis aero fitment(im guessing the least thick for the plates and shortest shank length for the fasteners). summit techs werent helpful. idk im lost any help would be appreciated.