Did GM,specifically Chevrolet use the same spline shaft diameter(where the steering rod indexes through the center of the steering wheel for it to press down on) for a number of years? I have a late-model(ugly) steering wheel on my truck now that I want to replace with an earlier Corvette wheel. I've taken a pair of dividers and the center-splined opening of the two wheels is different by 3/16" or so? The column is a 73 Caprice.Nothing has been modified on any of the three items;column or wheels. Hope this makes sense? Thanks for any info!