ron ayers has the suzuki boots for the t500, as does paul miller motorcycles. I have orderd that exact part from both places and gotten it. they are $32 per boot and are also available at your local suzuki dealer. If they are for a 71-75 T500 the part number is 13110-32200
A couple of years ago I worked on a gt550 where the owner had done that. He was convinced that the bike needed a carb rebuild and other things. I ordered just the boots and installed them and the bike ran better than ever. If you look inside the rubber boots there is a special shape (it necks down) that isn't replicated inside radiator hose and will slow the incoming intake charge. Plus radiator hose doesn't seal all that well to the carbs, it is really hard to get a leak free seal with just the clamps.
In the past I have used radiator hose to sleve dry rotted rubber boots, sealing the space between the layers with silicone but that was only when the boot was unavailable.
With a two stroke you really want to have new rubber boots with no air leaks whatsoever. The smallest air leak will cause you to hole a piston fast.
FYI on cb750s, there is no internal shape so as long as you had a hose that was the same inside diameter as the stock rubbers you should be ok. The problem is that the inner ones are curved and unless you can find a radiator hose with the same curved section they usually crimp up.