Ian G might have some he can send you - there's a link to his profile in my signature below.
Even if your clip is fine it can sometimes take a lot of force to get one end in - I know on the several occasions I've taken my rear seats out, the first side you push down on clips in straight away, and the remaining side takes some jumping up and down (with more force than seems necessary or reasonable) on before it stays in place.
It doesn't matter which side you do first, it's always the other one that doesn't seem to want to go in, in my experience anyway.