Can you help identify these wheels and calculate the offset

[GTA_G20]

Before I start I did search carrera 4 factory offsets to try and calculate these myself but had no such luck locating these.

So I bought 4 wheels off a guy with a 2002 carrera 4. The wheels are 245/35/19x8 fronts and rears are 275/35/19x10. He had 23mm H&R spacers up front and nothing in the rear. \There are some markings inside the wheel stating the wheel size and width but nothing about offset or brand of wheel. Im trying to guess what the offset and make/model these might be if you can help. I do believe the guy I bought them from painted these wheels as well.

Also here's a picture of the wheels if you know alot about brands and models I'd appreciate a guess. Thanks in advance guys

[Richard Hamilton]

Why not measure them up and work it out?

Then go to http://www.1010tires.com/WheelOffsetCalculator.asp with the existing and new offsets, and it will work out what to do.

[GTA_G20]

Why not measure them up and work it out?

Then go to http://www.1010tires.com/WheelOffsetCalculator.asp with the existing and new offsets, and it will work out what to do.

Oddly enough test fitted them on the boxster and they fit w/o rubbing. weird but im not complaining