Wheel confusion

[Brnmcadams]

I have a 91 rcsb im installing a 2/4 on I found the wheels I want but It don't show anything for back space will they fit? Will they tuck if I decide to go lower?

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[Stumpy]

https://www.rimsntires.com/specspro.jsp
^That site comes in handy. I've used in a bunch when trying to figure out fitment, or tire diameter.

The +-11 on the front is confusing, which is it? That's about an inch difference.

 

[Brnmcadams]

It would be 4 backspace on the front and 5.5 In the rear are those good numbers