Here's a space station. My carbs came with 4 of them.

They don't go too good at high speed so I'm converting them to X Wing fighters, like so:

This should get me up to warp speed.

Look like you are making them look like the intermedite venturis from a weber 3 barrel , I may have somehtin you dont need to cut up..

whats the O.D.?

These are the secondaries in 40 IDFs. The dia is just under 41mm.
They take about 3 hours each to prep, but I seriously doubt you have a suitable replacement. I'm trying to create the absolute smallest air restriction in the throats.