If you either have or can find a 5 hole wheel that fits the center of the hub snugly, simply use a transfer punch to mark your holes. Then just drill a pilot hole and then your final hole size for the studs you are going to use.
Here's what transfer punches are in case you don't know. You just need the correct size to fit the lug hole in the wheel you use for the pattern. Most industrial supplies will sell single sizes and are typically of higher quality than what can be found at HF.
http://www.harborfreight.com/cpi/cta...temnumber=3577
http://www.rlspellmanmfg.com/index_punches.html