Odd-ball Windshield Frame - What Gasket?

[herbsflat4]

Can anyone help me locate a gasket to use with this style of windshield frame? I bought one for a Manx windshield and it was was to narrow so I returned it.

Here is the entire frame without any glass.

Here is a close-up of the bottom bar. The bottom side which will make contact with the hood is curved so I feel like a large dished gasket is necessary but I can't find anything online that references this frame style.

[weasel_ugs]

When I had my glass replaced the glass company just used black urethane.