Help finding base gaskets.

I have a A100 engine, it has a 49mm piston.

I found the cylinder with the gasket that matches engine stud spacing. But I need only base gaskets.

Stud spacing is 43mm.

There is lots of 80cc base gaskets and they are 45mm stud spacing.

And yd100 is different spacing.
You might be surprised to find out that you can use a good thick cereal box or cracker box such as Ritz or chicken and a biscuit and make a base gasket out of those it may not be a perfect solution but it will give you a decent enough seal I would also recommend that you use some RTB silicone the high heat kind to get a better seal, I have also heard of people using soda cans to make gaskets as well