Going by the parts diagrams at http://www.alpha-sports.com/suzuki_parts.htm, I think you need model #MP-29, $38, which has the external threads around the hub of the rotor/flywheel (35mm external puller with 1.5mm right-hand thread pitch). Since they have a complete line, you should be able to give them a call and make sure it's the right one.
(There are two models that mention GS1100's, the other one is #MP-14 (which is a puller for an internally threaded hub, 14mm x 1.5mm RH thread), but it says it's for the GS1100/GS1150, which implies the 16-valve GSX model engine rather than the 8-valve GS engine).
I just fed "suzuki 35mm flywheel puller" into google. Here's what popped up:
$36 at http://www.repairmanual.com/items/17/10472
$32 at https://www.partsnmore.com/cat_index...ategory=engine
(scroll down or search in the page to part number 35-0062)
(the internet is really nice sometimes...)
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