Hey Ken , from the pic of the 3/4 and 1/2 spacer it appears that the 1/2 in spacer was hammered on top of the 3/4 with the long studs sticking out/ take a cold chisel and see if you can maybe seperate them some , if so continue around the outside and eventually get it off there making you to be able to unbolt the 3/4 . If you booger them up I don't think you will be out much from the looks of them ( sorry they look like crap
to me , and I'm a CSOB ) .
As far as the new suds and such in your future , figure out the offset of the wheels or use the backspace you measured earlier , this will give you an idea of the spacer thickness you may need , when you got your spacer thickness figured out
( 3/4 plus 1/2 equals about 1.25 inches ) you might can get by with a 1.00 inch thick spacer. If thats the case 73mm studs might be what you could replace the hub studs with and go with a spacer that doesn't require that it be bolted on , just slide it over the long studs making sure that you have enough threads extending beyond the nut. Steel nuts are realitively cheap and the center cap would cover them .
Or you can get a good set of quality bolt on spacers that will bolt to the hub , then bolt the wheel onto the spacer, = 2 sets of nuts per wheel just to run the wheel. The fellas are right about the ebay spacer thing , they are a bunch of them on there now , as well as steel plated nuts.
Any who you do have a valid problem that you should remedy before some serious street time much less any kind of track time.
Let us know what you find out about the spacer situation....
Jaxdream