Just offered up the DS supplied OE 93500-060-28A (6x28) K1 petrol cock retaining screws and found they are too short with just a few mm thread left to bite. The photos show the 'OE' screw against the one that came out (6x35) without the fibre washers and tank gasket fitted which would take up even more valuable thread.
The solution is to buy a couple of 6x35 pan screws or fit the ones that I removed, but was wondering whether anyone else has found this, or is it just me?