There is a fella on ebay selling P08 grips made in Australia. On his ad, he shows a Umarex blowback P08 with his grips installed. He plainly states that his grips are NOT a drop on grip, and they have to be fitted to the individual P08.
I had wondered about the shoulder stock fitting. That promo offer from Airgun Depot that came with my P08 for buy one, get one free was a nice offer. I received my two(2) boxes of 25 each CO2 cylinders for $14.95!! That is a smokin deal as far as I am concerned..... $.30/cylinder.