Wes - If you're lucky enough to have the original Fuchs - all 5 including the spare - for your 74, then stick with those, & keep a 5th from the others if your Fuchs spare was "stolen" by the original dealer.
Send them to Weideman Wheels in Oroville (closer to you than Al Reed down here in Anaheim who is equally as great at restoring these to factory correct, polished, or whatever you're looking for.
As to fitment - ALL 73-76 MY 914s must use the Fuchs with part no. ending in -01 with the inset machined out for the front self-centering/hubcentric hubs' lip (see pic below).
If any on yours are p/n: -00 without the groove - either machine them with the inset or sell them to 70-72 914 owners without the hubcentric front hubs.
Stu - all Fuchs use the
same longer wheel lugbolt as shown at the 914 PET parts catalog that you can download as a pdf for free at the Porsche website's Classics section under documentation there - and that was also the same for all other 4-lug Mahle & Pedrini alloys too (38 mm IIRC).
If you're not using the long ones, then you may not be getting enough threads in there for bite & safe driving.....or you may have the early improperly made non-hubcentric p/n: -00 Fuchs on there which then sit out on the front hubs only bearing on the hubcentric lip - also very dangerous.
So pull your wheels & look at the backsides for the inset in the pic below, & same deal with p/n's -00 vs -01 on Pedrini & Mahle 4-lug alloy wheels too....
Click to view attachment.
Cheers!