Does anyone know who makes aftermarket wheels to fit this oddball bolt pattern?

 

American Racing, Eagle, and Ultra Wheels are all supposed to manufacture them. Eagle only produces the 143 model now. The 121 and 171 models which were also available in 7x150mm have allegedly been discontinued. AR has the Atlas in chrome, model 660, which is a 17"x8" wheel. Ultra Wheels has the 164-S model available in 16" size only in the 7x150mm pattern. You could also contact Boyd's wheels and have a set made but expect to pay through the nose and wait up to a year. Any other small manufacturer of aluminum wheels could probably cut you a set.

UPDATE, I did a quick search on eBay and found that Eagle Alloys also makes the 058, the Baja style wheel, they just came out in 7x150mm. It looks like the 250-350 Super Duty's optional alloy wheel.