I am finishing up my GEN 6 BBC build. First time working with a GEN 6. I got a Fel Pro One Piece Rear Main Seal for it. It appears to be two seals, one inside the other. The package listed an installation tool , which seems to not be available any longer. Can anyone help with the install? Which way does the seal go? Any tips on getting it in without damaging the seal? They are kinda pricey! Pics would be great! Web search was not very helpful.