Bit of a general question but it would help to get some input from others, especially those living in the US. I have a stock style rear light and a stock rear fender on my 2007 WR450. I have made up a licence plate bracket using Kydex thermo plastic sheet thanks to someone's useful guidance on this forum. The problem is that I have had to add some nylon spacers and so this combination means that I need an additional 10-15mm of depth and the three stock self tapping screws that hold the rear light on are no longer long enough.
As the plastic towers in the rear fender have already had a thread cut into them by me using the stock self tapping screws I need to get longer versions of the stock screws. The originals are M5 x 15mm and I need M5 x 30. The problem is that in the UK everywhere seems to only supply imperial and not metric self tapping screws. The stock screws seem to have had their points cut off before coating in black.
My question is whether there is such a thing as a self tapping screw specifically for plastic rather than metal or wood?
Also whether in the US you guys use metric or imperial self tapping screws as standard?
Finally it is a long shot but has anybody come across M5 screws in anything longer than 15mm on any parts on any bikes as the dealers here can order parts if I give them a part number.