Good idea!
I think maybe a 1-3/8 coupler would work... not sure if it's worth the expense though:
Hub-City-0332-00365
I'll see what the plasma cut guy thinks.

Here's the measurement from the spline itself:
[img]https://imgur.com/KZZCNlg[/img]
Attachments
KZZCNlg - Imgur.jpg (26.67 KB, 80 downloads)


'59 Chevy Suburban, NAPCO