Do yourself a favor and use factory Volvo seals as all rubber is not created equal and you really do not want to have to pull the trans again because you save a few bucks on the seals. The front pump seals can be kind of tricky to do, if you can get your hands on some hydraulic assembly lube to put them back together with it will help big time. If you look in the book it will show you pulling the front pump out of the case to change out those seals among other things, to change out just the seals if is far easier to simply pull the bell housing off as an assembly. Cleanliness is the order of the day on this operation, make sure everything is squeaky, squeaky clean before you put that bell housing back on over the pump. Make sure that you change out both shift shaft seals and the input shaft seal as well while you are in there.

Mark