When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
Sorry for crap picture, but on RST recaro runners, there are plates that sit for the rear bolts either side.
What's the purpose of these? Obviously they slightly raise the rear compared to the front but beyond that I don't understand why they are there or required.