Got one attached to my Tiger.
Bought from "thesheepskinshop.com" £50. Cut it to shape myself. Hold it on with velcro. Actually got two out of one of their "small" rugs.
Supposed to be washable according to the web site.
Are flogging small sheepskins suitable for GS's. I've just ordered a charcol coloured one for £38 inc vat and P&P.
They do a fitted one but I didn't ask the price. The chap was pretty clued up on Gs's, sells a steady amount to GS riders apparently, asked if I had an adventure or standard seat etc.
Just had a browse through these comments about sheepskin for bums etc. I can vouch for the comfort factor. Lovely feel, even with leather jeans on. No sweaty bits in the hot weather and a warm backside when its cold. Got mine from easirider in Hackleton, Northants and its my bike in the web ads. Good VFM.
Its weather proof and easy off for the reall sh*tty stuff so you don't have to sit in it. Did 540 miles on the BMF Sunday coming from Inverness to home in Northants in absolutely POURING rain without any major complaints. The sheep wasn't too happy, though.
Just have to suffer all the sheep jokes for ever now though!!