They look much nicer than the Fazers's swinger too.
I have a TRX swingarm in the garage with one of the chain adjusters snapped off in situ. An engineering shop could probably extract it. I don't have the swingarm spindle, only the rear wheel spindle, chain adjustment blocks & spindle nut & mudguard.
Problem is no-one's tried it & I now have a Fazer 1000 so can't confirm.
I think it will fit straight in @ the swingarm spindle end.
Fazer's rear wheel is the same width, think disc size is identical so fits straight in
You could use the Fazer 600 brake mounting bracket and torque arm combined with the TRX rear caliper, but from memory u need the longer TRX brake hose. Andy on the old Foccers site posted info re fitment
The TRX shock is normally about 325 mm instead of the Fazer's 295/300mm, but perhaps different length dogbones might allow you to retain the Fazer's linkages, failing that u might need the TRX ones. I'm fairly sure a mixture of parts from both bikes would allow the swinger to be fitted successfully, but to my knowledge no-one has given it a go.