Not sure but I think the chassis numbers are on the 2"sq tube under the dash. Can't check right now but should be able to tomorrow. I can't imagine that the numbers are in a non-standard location.

The only real downside that I find is getting in/out over the side diagonal bar. Once in it's a cozy cockpit.

Then I question taking what is probably the strongest and safest Roadster chassis and gutting it. But then I'm the guy that added to the overhead cage.

Jim