Was wondering is there any reason why their different?! Noticed the outer blue ones are 10.9 grade but the inners are 8.8 despite being the same size/length etc?!

Main reason for asking is I want to fit new ones when I get my beam re coated and I can get hold of 10.9 grade ones for nothing but found it a bit odd that theres 2 different grades when their the same size!! (assuming someone hasn't fitted the wrong ones in the past)


Cheers