Still working on my rear axle, and I secured new Outer Wheel Bearings and Oil Seals from SNG Barratt in a 'kit'.
Part #7993K (the Timken bearing part # is 7993)

The Oil Seal that I removed, was a metal and leather pressing. It was 'solid' on both sides, and fairly heavy/substantial.
The replacement seal is rubber formed around metal, fully 'open' on one side, and light in weight. Its own part # is 8436A.

Question: the oil seal designs are WAY different than each other. Do you just fill the 'open' area with grease and press it into the retainer?

See photos showing the old and new Oil Seals - from both sides.


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Pressing the new seal into the retainer (steel housing) is the tricky part.
The housing is rather flimsy, very often it gets damaged getting the old seal out, if you got the old leather type seal out, with out damaging the retainer, then you did well.
I've seen the new modern seals come with the retainer, but can't remember where.

I used a small amount of high pressure grease on the outside of the new seal and housing when I pressed it in.
I fail to see the need to fill the open side of the new seal with grease, but I can't see it hurting anything.
However it's important to grease the contact area of the new seal where it makes contact with the axle as you bolt the housing in place.
The open end of the new seal faces towards the centre of the axle, or inwards.

For anyone else reading this, the new seals are common as dirt and can be had almost anywhere.