The widest Chrysler C-body wheel was usually 6.5" rim width, either 14" (earlier) or 15" (1970) AND usually on station wagons. Possibly some police vehicles. The 15x7 wheels, as pictured, were only on the E-body cars, from the factory. Normal C-body wheels were (post-power disc brake) 15x6, which is also the sizing of the earlier W23 Class II 16-Slot Road Wheels from 1970 and later. There were some one-year 15x7 W23-style wheels on Chrysler LeBarons, in about '77 or so.
"BACKSPACING" is important, too, rather than just rim width. There had to be a reason that Chrysler didn't use the 7" rim width on C-body vehicles. Other than just optional cost.
On the 15x7 wheels which are on my '77 Camaro, the backspacing on the 7" wide rim are supposed to be 4.25". Be CAREFUL how you measure the backspacing, too! I suspect that most of the repro Magnum 500s on B-body cars (which were not available on those cars in that rim sizing, when new) are either 4.25" or 4.00" backspacing.
On the '77-era Dodge Charger SE, the above-style wheel was available in 15x6.5" sizing. The smaller holes are for retention of the center cap, of which there are various ones for those wheels, from the earlier E-body cars and such. Possible salvage yard items? I ended up with a set on my '70 Monaco Brougham as "rollers" and they look pretty good, to me.
Enjoy!
CBODY67