I have Rosepetals as well and had to use the very thin supplied spacers on the front for calliper clearance. Those spacers have a recess around the stud holes and the tube nuts (the longer supplied ones) locate into the recess when you tighten the nuts up. No need for longer studs.
My Rosepetals are the standard 4.75 x 10.
6 x 10 are going to stick out well past the arches.
Edited by whistler, 19 March 2023 - 10:15 AM.