srad 750 front and rear end in a Katana pop up

[Pedda]

srad forks are short so will lead into ground clearance issues if you like doin turns on your knee.
The stem is longer than the popup headstock, so you either need to cut it or make a new one. Or take the old popup stem but that won't fit to the last 1/1000. Best option is modifying the srad stem imho. (I did so when I used the same fork in my last project Kat.
The usd forks are remarkably wider than stock forks, so they might foul the fairing. They do on normal Kats, so I'm not quite sure about popups.
Depending on the wheel you use: the srad wheel doesn't have a mechanical tach drive.

[johnr]

tbh id go for bandit stuff, lots cheaper and more plentiful and its got longer forks so not as much as an issue with ground clearance.

[Pop-Kat]

Yes bandit back end will go in as it's narrower at the swingarm pivot, you'll need to make top hat spacers and weld on shock/linkage mounts to the frame, Chain run will be tight with the 5.5" wheel but a good quality 520 chain and sprocket will fit in, Also you'll maybe have to lose the footrest hangers or cut and widen them a bit for the swingarm clearance, but test fit first to see. Bandit front end will need a stem swap, it's shorter but should be ok.

Srad forks way too short, your fairing will hit the mudguard and you'll have ground clearance issues. Srad back end will be wider than stock so much more work to fit and the 6" back wheel is too wide for chain run. Anything will fit if you have the will but when there's other stuff out there that will fit a lot easier it's not worth bothering with the extra work and hassle.

[Pop-Kat]

As said much more difficult than it needs to be, also you would need fork extensions to fit the front which complicates things even more as not easy to do. Best bet sell the srad on and get parts that will fit better.