Hi I have just replaced the front wheel bearings on my 1972 mark 1 MAR. It had felt washers in tin housings, I decided to replace the felt & tin with lip seals, as I believe these felt seals leaked water into the bearings. You need 2 one on the brake side & one on the other side, if you take your wheel to a bearing supplier they will measure it & supply the correct seals. Next time I have the front wheel out I'll check the seal number.
Ausy Steve