Suzuki 2 Strokes

Rarer than lips on a chicken! I know these are valuable. If nobody here wants them, they will go on eBay. Last one I saw went for $45. It was new old stock. These are not, but as good as.

I may be the only person on this forum that doesn't know what these are but I am guessing they are some kind of filter for a GT550. If I have something like that on my 72 GT750 then I have not seen it yet.

They are the unobtainium filters on the SRIS valves. Your GT750 has these valves but the early ones are not threaded. They are a taper press fit. They have wrench flats for removal but must be whacked back in. All the GT triples have SRIS valves.
If you don't know where they are, get way down on your hands and knees. Look at the front bottom of the crankcase. You'll see some small black hoses. Those hoses run from the valves in the block to the intake manifold;d on an adjacent cylinder. SRIS = Suzuki Recycle Injection System.
The valves are still available new (the threaded type) from Suzuki for around $15.00. BUT they do not come with the filter screens. The screens usually clog and collapse over the tears. Some filters has a nylon screens. Others (like above) have brass screens. The filters have been obsolete for many many years. I even check with Reiner in Germany. I was offered 3 used ones in fair condition for $12 each plus shipping I didn't like the word 'fair' so I installed new valves w/o filters.