I have a set of 16" 3 piece Gotti J55A Wheels off my Porsche 930. No markings on the inside of the wheels but from my measurements the fronts looks to be 16X8 and 16X9 on the rear with a 5 1/4 back spacing. The tires are 225-50-16 and 245-45-16.
They will need a good polishing, I did a small spot on one of the front wheels and it came out very nice. On one of the rear wheels the lip has a small bend in it. Look at the rear wheel on the right around 2:00