Need some help identifying these wheels

I’ve had these forever and always thought they had -18 offset because that’s what it said on the sheet when I purchased them from discount years ago. Long story short one of them has a bend in the rim and another is off by 4.5 ounces and it’s getting to the point where they can’t balance them properly, so I’m looking for a similar set. When I took a look at the casting marks inside the rim, they don’t make sense. First it says 8lug, these are 6x139.7. Then it says 17x8.5 instead of the 17x8 on the sheet, I know I have the sheet I’ll post a pic when I can. And then it’s stamped +0 on the hub so, am I crazy or? What’s the actual offset?

 

Simple enough, just take a couple measurements. Measure the overall width of the wheel, not from the outermost part of the wheel lip front to back but from the flat area of the wheel . Imagine the tire being unmounted and you are measuring the actual rim itself, where the tire bead meets the wheel/ inside the lip. Then measure from hub mounting surface to the same flat part of the backside of the wheel to get your back space. Once you do that there are plenty of wheel charts to determine offset relative to backspacing for any particular wheel width.