Universal steering couplers

Kernel Sanders said

Please make note that the MA-Mopar 36 spline is NOT the same spline as the Corvair/Vega, they are NOT interchangeable and will NOT fit.

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Right, I believe it's is 0.620 36 spline. I found one at speedway motors for $50. The 5/8 ones are 0.625 so that's probably where people run into issues.