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Steering column spline size

  • 1988
  • 911 Carrera
Mileage: 
193 000
Body and Interior
Kamloops, 
British Columbia

I have a 1988 Carrera that has an aftermarket Grant steering wheel.  I purchased an OEM wheel from a PCA memeber that he said came from his 1988 Targa.  I got my car out of storage this week and went to install the OEM wheel on my car.  The spline on the steering shaft appears wider than that of the OEM steering wheel and I cannot install it.  Is the issue that I was sold am OEM steering wheel from the wrong year (is the steering shaft spline a different size in different years?),  or would the previous owner perhaps have changed out something on the steering shaft to allow the aftermarket wheel to be fitted?  I am perplexed and would welcome any thoughts on this.  

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