If it's the same type of cab as Studio Vintage SV212 then casters with standard M10 threads should fit. I have that on my SV212.I have the Studio Jubilee vertical 2x12 cab and I am from Europe so I will probably buy from Thomann.
Anything you can recommend that would fit without the need for drilling and also some wheels with brakes?
Yup, I’ve got Marshall casters on my studio cabs.That cab has the caster sockets already right?.If so I would get the proper casters from Marshall designed for your sockets.
Can't beat that.