Hello all,
I am trying to determine the difference between part #'s for the front hubs.
91134106506 for a 911 koni strut
90134106504 for a 914-6 strut
I am going to change my stock -6 struts over to later 911 Koni struts. Don't want to get half way into it and find out I need more parts.
Thanks Andy

I think it’s hub centric versus non hub centric. Early 901 depended on the lug nuts to center the wheel.

This shows the differences in 911 hubs.

Click to view attachment

The difference between the 04 and the 06 is in the bearing cap. Outside fit vs inside fit.

Wow !!! awesome info. I have printed that out and added it to the Porsche file.
Thank You gentlemen.
Andy

So pre 74 are not hub centric?

Right. Lug centric front and rear.

My original 73 is hub centric, as I found out when trying to mount spacers.

It also depends how you define the year. Build date or model year date.