Mine went. I just got the lucas one from eurocarparts. Can't remember there being 2 sizes. Easy job to change anyway, so if needs be, remove old one first and take it in there.
They only have that one available on Monday for me and I go away Tuesday so need it sorting. Think I'm going to have to buy the rtx one or whatever it is that's slightly cheaper
Wondering what the more expensive one is for? Maybe the Si?