Suzuki 2 Strokes

I have a mate who is looking at stripping the carbs on his J model 380. He was wondering if there are one or more carb kits available for this model. If so, is any better than the other? Are the kits like the ones for Kwakas where most bits are more trouble than they are worth or will they add something to the bike? Thanks for any help.

The kits we get in the UK are Keyster, some people have no trouble with them, others get carburation issues (I believe they say the needles are the wrong size). No idea if genuine Mikuni spares are still available, either new or NOS