59-60 Eldorado hub cap and rim

[60eldo]

   I have a few 59-60 rims here and Im trying to mount eldo caps on them. Some fit some dont. Some of the rims are 16 5/8 outside measurment ,some 16 3/4. Was there a different rim for the eldos and fleetwoods. I think there was, but Im not sure

[Ken Perry]

The rims are the same for all 59 and 60 Cadillac,commercial chassis is a heavy duty wheel,but takes the same cap. 58 Cadillac also same wheel. Ken Perry

[35-709]

All these wheels are identified on the inside of the rim (tire removed) by manufacturer, size, date, part number etc., the secret is knowing the codes.  Motor Wheel and Kelsey-Hayes are 2 that I find.  The Motor Wheel part # is X-40008, Kelsey Hayes is 43261.  This was discussed here back in 2014 ---
https://forums.cadillaclasalleclub.org/index.php?topic=129440.0

The link given to a catalog in one of the later postings at the link above is no longer valid but the link below will take you to the same place.   
http://www.jholst.net/tires-wheels/MotorWheelCat_1964a.pdf

Simple answer, though, is that if the correct hubcaps don't fit, it is not a correct wheel for a '60 Cadillac. 

[60eldo]

Heres the rim 16 3/4 that the eldo cap fits. In the other article from mr newcombe, the gent there says a true rim is 16 5/8, I beg to differ and think they are 16 3/4, hope we can figure this out. Un fortunatly I cant take all me tires off to look. Years ago I had a guy in Sweeden wanting a 59 rim and was spicific on 1/4 inch difference.

[60eldo]

 Does anyone have a 59-60 rim, proper stamping, that they can measure from outside diameter , so we can find out the truth cause I can guarentee you that 16 5/8 rim, will not allow your cap to fit.