sp also offer life time warranty.
kinchrome can be difficult to get warranty out of.
repco also offer lifetime warranty, and they have a lot of stores.
ive had 1 item from repco break, they handed me a new one.
have had 2sp items break.
3 weeks later, i got replacement pieces.
also, is it leaving a puddle of oil, or is it just what is on the exhaust?
if you have recently had the clutch done, that could be oil from the gearbox when the tailshft was removed and the box pulled out of the car.
clean it down with degreaser first.
see if it comes back.
could just be a lazy mechanic who doesnt clean their jobs.
hope this helps.
keep us updated.
also, there are a lot of DIY write ups in the diy section.
search, im sure someone would have written this one up.
read it a couple of times, and go in prepared.