Those in the pic appear to be 14", but again, it's tough to determine solely on the picture. ALL snap-on center cap style SSII/SSIII center sections are the same diameter regardless of rim size. Whether or not they'll clear any aftermarket brakes is obviously another question. The hoop will be the difference in the 14 or 15" wheels.
Not sure who would make the best wheels if you sent them the old wheels, but even if they're 14" wheels, the centers could be used in 15" hoops and get them chromed and make your own set. If you do, the backspacing on 15x7" SSIII wheels on an 85 442 is 4". Don't believe any other BS that they're 4.25". Wheel Vintiques used to use 4.25" BS on their repros and after several attempts to tell them they're full of crap, they kept telling me they were correct. Those idiots. I've measured them personally with my Craftsman model 1019 Laboratory Edition Signature Series tape measure. The kind used by Cal-Tech high energy physicists. And NASA engineers. Dead-on-balls-accurate.
But to get wheels made depends on what your goal is whether it would be worth all the expense and trouble or not.