3 point seat belts

["Dixon, Clifton, TSG, 134ARW, CP"]

Howdy y'all, 
I plan to put a roll bar in the roadster in the next couple of weeks, and I
will also be installing three-point belts as well.  I'm wanting to be as
economical
 as possible without risking safety, of course.  Any advice?
Moreover, are there belts from other cars that are known to fit a roadster
well, i.e.,
miata, etc. . . ..  

Thanks
Dave Dixon

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