The seals will be a drive-in fit, not easy to start into the housing at all. If they have a steel shell, try tapering the leading edge just a little bit with a bench grinder, then use a big socket almost as large as the outside diameter of the seal as a driver. Use a BFH and don't be timid once the seal starts into the housing. Be careful and don't mash any fingers!
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!