If and when you finally get these seals, if you fit them yourself make sure you put then in with some sort of drift which fits the hole size exactly and also
1. Get them 110% straight in the locating hole, slightly off centre and they will **** oil.
2. Before removing he old seal from he casing, run a scribe or something round the mating face of the seal so you know how far to tap the new seal into position, as you can push them in to far and then they don't make a seal, they only need to be 1mm in to far and your stuffed.
Steve