I don't want to derail this thread, so PM me if you want to discuss, but there's a thread on creating your own SPEC Boot, since they're pretty much unavailable. This is the mod I've been using for 5 years now.Lowviz, perhaps you are interested in getting that MK15 and do a swap with a MK10, as you did with my one. I was very happy of the swap!
What I am searching now is the SPEC rubber boot for the MK10, so that I can saturate it with silicon grease, as I did with my two newer MK5... The two older ones have no SPEC, unfortunately.