unfortunately I cannot give you the specific information you requested, but since you work at a fab machine shop I'm sure you have the ability to take one of your rims and measure the dish of the rim, and then make your own wheel weights. The square holes in the rim are for the bolts that mount the weight to the rim. You can also do a search of the forum for the many pictures that you can use as a reference of the general size and shape. But there should be somebody that comes along that should be able to give you exact dimensions. Good luck with your project and keep us informed.