Very rarely FP1 related stuff pops up on Ebay, so if you've not seen it already, here's an auction for a pair of Leathers with a a couple pics of what appears to be the GP1 (forerunner to the FP1):

https://www.ebay.co.uk/itm/304169129925 ... SwJ41hVg2E

i did spot these the other day. not so sold on the GP1 looks though sadly

https://www.ebay.co.uk/itm/185151467950 ... R-yexMagXw

ideal to save your knees when you crouched on the garage floor again!