I've bought their kits before but found I can buy the 2 rear seals only elsewhere on ebay for less than �5 now. I'll try and find the listing.

M and p do list the 28mm front seals only but never seam to have sufficient stock
http://www.mandp.co.uk/caliper-seals...n-od-28mm.html

I found generally it wasn't the seal causing the pistons to bind but corrosion on the calipers internal portion that was pushing the seals out.

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2011 xt660z.
Yoshimura cans ,kev mod,Dna 2, Stahlkoffer panniers,Hepco Becker box,Givi crash bars,Mita e07 tyres.