factory wheel backspacing 3/4 72 GMC Camper

[wallym]

Hey Guys:

New to site. Did some searches in the forums and couldn't find exact answer I was looking for. Got a 72 GMC 3/4 Sierra Granda bone stock with factory steel 16 1/2 in 8 lug wheels (2WD). Looking to upgrade wheels. Don't want to go wider than 8-9 inch. Are most 8 lug bolt patterns the same? What backspacing do I need if I want to be close to original? (4.5 all the way around) Great site!!

Thanks in advance for your feedback. Been searching for decent looking wheel for this truck. (Needle in a haystack) Not crazy about the modern wheel look. Like the aluminum slots but looking for decent chrome wheels for about $150 each. Any thoughts would be appreciated.