OK, probably a really daft question, but here goes...
I bought a Superstar Components 203mm disk brake adapter (as per image below) for my Rockshox Pike/Sram Guide setup. The bolts supplied with the adapter allow me to fix it to the fork easily, but the existing bolts from my caliper are too long to attach it to the adapter (used with a 180mm adapter previously).
Does anyone know what specific bolt type and length I require so that I can order online? No decent bike shops/DIY stores near me.

I bought a Uberbike adapter and they said to get the m6x20mm disc brake caliper mount bolt whick they sell in titanium.
the existing bolts from my caliper are too long
hacksaw a bit off ?
(leave a nut on the bolt while cutting so you can unscrew it afterwards and revive any damaged thread)
Thank you both! I think I'll just buy some new bolts just in case I decide to revert to the 180mm disc at a future date for some reason.