In keeping with the "more questions than answers" theme here...
I think these are 15 X 6 stock rims from a Kaiser-era wagoneer or CJ5/6. I haven't tried to measure the width though, they could be 5.5". They may have come to me on my '62 CJ5 but the only pictures I have of it from then had hubcaps concealing the wheels. You can see the hubcap scrape marks on the edges of the wheel and three hub cap bumps on the center disc. Notice the center disc was square prior to being stamped, causing an arch (in the gap) that is opposite, not concentric, with the wheel diameter. They have the K-H stamp on the raised lug nut tensioning ring. The center disc is welded on to the rim.
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This is possibly what was on my '58 wagon when we bought it in 1974, but since these are 15 X 5.5 I doubt that they were original. I think all of the original station wagon wheels were 4.5". They also have hub cap scrapes on the inner edge, three bumps on the center disc, and have the K-H stamping in the raised tensioning ring. The gap between the disc and rim is concentric. The center disc is welded on to the rim.
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I have three of these (need two more if they're correct for a '58 wagon) and from any period pictures I can see clearly, appear to be a likely possibility as correct for late '50's wagons. They are 15 X 4.5 and do not have the hub cap bumps. The gap between the disc and rim is concentric. They have the K-H stamp in the raised tensioning ring. The center disc is riveted on to the rim.
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Like Doug said, "Any help would be appreciated."
Thanx!