Longer bolts for the PiBow Zero case?

Does anyone know a good source of longer M2.5 nylon bolts for the PiBow Zero case?

The supplied ones are fine for the case itself, but if you add a pHat they’re irritatingly about 5-10mm too short to be able to secure the pHat as well. I’d only be looking at 4 (as I have two zero’s in PiBow cases, 2 for each) but I can only find a couple of distributors at all and they sell the things in bags of 100’s or more.

Or could Pimoroni be cajoled into adding a couple of longer bolts plus ideally a couple of short spacer cylinders (short bits of Teflon tubing would work fine, those I have already) to the PiBow zero kit?