2nd Gen Non-Engine/Transmission wheel backspacing questions

[kbond]

Getting ready to purchase the Mickey Thompson II wheels. I am unsure of which backspacing to choose. They have listed the 4 3/4 or the 5 1/8. I am running the Super Swamper SSR 37x12. 5's and I don't want them to stick out to much. Seems like the 5 1/8 would be the one's I want if they measure from the inside hub to the outer wheel. Anyone have any input?

 

[kbond]

forgot to mention the wheels are 16. 5x9. 75.



Thnks