Two mounts for the Runcam Thumb on the Diatone Roma F4 LR, mounting hole spacing is 26.5mm for some odd reason.

The offset mount is just in case you run a higher angle on your FPV camera, to prevent the Thumb from coming into view. Otherwise, I recommend the standard mount as it is less prone to vibrations and shaking about and braking and all that fun stuff.

BTW this mounts over the front bolts if that wasn't obvious. You'll need some m2x6 bolts at a minimum I think.