Re: two questions
1. pressure wash engine and trans. Then you can start looking for oil leaks. Could be distributer, rocker cover, head, rear main seal. Probably something high if it's all over the tranny.
2. Bolt pattern, if you're talking about wheels they're 5 on 5.5 ". Ford, Jeep and Dodge of various years use this pattern. Check before you buy. Check for offset some older wheels will not fit over the front calipers and the centers may be to small to fit over the hubs