The TM-38 flatslides have the same mount diameter as the standard carburetors so they fit on the CX spigot inlets. They are spaced differently so you must re-rack them wider by 25 mm to 160mm then comes the choke linkage, and throttle pull. I use a single cable as the new carbs are linked mechanically (part of the re-racking) the real work is in the jetting (no surprise here) I run a set of header that I made from scratch 2/1 ceramic coated with a cut down (12") carbon sportbike slip-on muffler. When buying the carbs (ebay for fairly cheap) make sure you get a pair that don't have pressed in needles, the pressed in needles are hard to tune around. You can press them out but it's more work added. The flatslides are great, they have very quick throttle response, they even sound cool as the slides click at idle sort of like a Ducati with a dry clutch announcing how serious they are. The performance is the really interesting part, the bike (to me) doesn't feel like a 500cc bike, it pulls very strong especially in the upper rpm ranges. My jetting is 15/200 not perfect but it idles fine with a hesitation off idle. If you can afford it just buy TM-38 flatslides from Sudco. Sorry for the thread jack.
Cheers, 50gary