You can mount a Samurai master cylinder, but you need to put the brake booster and everything else along with it.
Give Hawk Suzuki a call, they have a bunch of SJ-410 parts. E-Bay is also a pretty good choice.
You mentioned they swapped a Samurai drive train in, did they swap the axles as well?
On my 84 the outer portion of the axles were the same as the Samurai. Your diff's and axles are different, and it is 3" thinner so if you swap Samurai axles on you need to move your spring pads 1.5" inward on both sides. It makes swapping finding easier if your going to make it a wheeler.
