Bandit can fit bst32 or bst33's... Here's a list of other bikes with those carbs, note not all bikes are I4's but if you're only after a parts set of carbs they'd do just fine... look on ebay, gs500 carbs should be easy to come by.
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Stolen from
http://faq.f650.com/FAQs/CarbMiscFAQ.htm---
Some parts are exactly the same parts as a Suzuki GS500E. Note the GS500E uses Mikuni BST33 x 2 Carbs.
The Suzuki '98 DR350SE uses a MIKUNI Carburettor BST33 (BST33SS CA. Model) Single.
The Suzuki DR350 EU model 1994 uses Mikuni Type BST33SS but US Model 1990 Mikuni uses TM33SS.
The Suzuki DR750S and 800S Specs also show a MIKUNI BST33, twin.
The Suzuki 1996 GSX600FT also show a MIKUNI BST33, four.
The Suzuki GSF 400 Bandit has MIKUNI BST33, four.