Welcome to Miniriders,
So do you mean fit the swing down Z50 bars by using the top tripple clamp plate off the Z50 as well as the Z50 bars ?
You'd need to measure the fork bolt hole spacing and compare them, and also the offset of the steering stem to the top fork bolts
The exhaust i'm not sure but one of the other lads will be able to sort you out.
Cheers, Craig