Go look in that bin brocktoon, you'll want those old seals. They're not a perfect fit as such however they will assist in keeping the crap out.
From what I've found it will be easy to grease the bearings through the 6mm allen key hole in the centre of the swing arm pivot pin, then just push the seal back into place. I reckon the grease will hold the seal in place quite well.
I only used the larger outer seal.
Lord of the Bings, kangaroo farmer