You could try wheelsforless, they can get custom torque thrusts, and I assume others. Expect at least $500/wheel.
Extreme Customs in Oshkosh can get them too.
I have custom made tt2, 15x12 with minimum bs, from Performance Plus Tires, in Long Beach CA. They are the go-to in so-cal for classic tires (BIG Coker dealer).
Be aware! A 15x10 aluminum rim is really 11" wide, so your 5" backspace is NOT zero offset. If they ask what OFFSET you want, you'd better know what you want. Same goes for your custom eights.
( I personally despise the metric offset bullshit. I don't know offhand what +15mm or -22mm is, and I DONT CARE! Tell me what the width and backspace is, and I'll KNOW what to expect. )