Tire size, pattern

1983 Dodge D150, Slant 6, 4 speed. I need to know what pattern of rim lugs I need. It has 5 lugs, but I see on sites 5X4.75 for example. Meaning? What size would I need? How do I know what rim that has 5 holes would fit mine without trying them on?

I'm not too sure on your exact model but I do know the second generation dodges (91 and up) are a 5 x 5.5".

FYI
5 x 4.75 means 5 lugs on a 4-3/4 bolt circle. not easy to measure bolt circle on 5 lugs without some math triangulation. You can "rough it' by measuring from the center of the spindle to the center of a stud and double your measurment. Any place that sells wheels should be able to tell you the bolt circle.

www.tirerack.com

5-114 mm's

more specific:

http://www.tirerack.com/wheels/tech/techpage.jsp?techid=92

hope that helps you; the internetz good stuff, eh?