Which seals are you taking about?
If its the ones around the spindles then the set on mine came from B&Q (plumbing o-rings!) They have lasted 3 years without any problems - they were the only ones I could get on a sunday afternoon!
Any Lucas diesel center will be able to get you the proper kit if you want it.
BTW it is a pain in the arse to get it all to fit back together - especialy if its cold, raining/ snowing etc etc (which it will be by the time you come to put it back together even if its a lovely summers day with temps in the 90's when you start!)