if you are a owner and want a seal, get a factory seal is the best maybe, because the chances that it will fit and install easily are very high
and you should be able to find one at John Knibbs and T.W.Chambers in the UK and even Protek
other outside venders are Custom Seal out of Australia people have been loving their products here and in the UK they are a new player
also there is a new seal vender in the UK called Britseal if they ship to the states is unknow
the oldest seal vender is ARH many of the seal are oversized so they need sizing, great for a tuner maybe not so great for the one-time rebuilder
and then you have Vortek, people have been loving their products but they are a new company compared to ARH and i believe they do answer their phone for help and advise
prices will be all over the place you said you got a seal in hand or on the way and i would just use it but seals are like Goldilocks porridge not too tight, not too loose , but just right
