XT130 Corona struts are *the* most readily available.
I used RT132 struts for my conversion, and LN106 4 pot calipers.
You need to consider newer longer brake hoses, and if keeping the dust cover/backing plate, a larger cut out section to fit the bigger calipers, and panelling the raised sections flat as they rub on the rotor. I machined down the 273mm Pug 605 vented rotor to 268mm so it would not foul the caliper. Re-stamped the rotor min thickness spec on the edge. Re-kitted the capliers and replaced the wheel bearings. Used 1mm washers to space the caliper more centrally over the rotor.
Read every search thread, this has been covered 1 million times.
Mitch.