Steering column/ wheel spline diameter

[Witofthestaircase]

I've come across a steering wheel that is purported to be from an Elan. It is 13" diameter with a fresh leather rim and three polished spokes each with three holes. It has a later style squarish boss, a 1" dish and a 5/8" diameter spline. Needless to say, no signature. It looks and feels nice so I'd like to use it. Prior to getting my existing Moto lita wheel off for a look, is that spline diameter one that I should be encouraged by?