Try a 6-lug rear end from an early Toyota Land Cruiser. Also, just about any of the Japanese pickups from the 1980's such as Toyota, Mitsubishi, Dodge Ram 50, Ford Courier, Chevy LUV, or Mazda have the same 6-lug bolt pattern as a stovebolt, but those rear ends might be too narrow.
Jerry
I recall measuring one of those Land Cruisers a while back, and it pretty close to the right width. They're also full float on most years. The only drawback I can think is how low geared they tend to be, something like a 4.33:1 if I'm remembering it correctly.
You also have to watch things with the Mitsubishi/Ram 50. I've seen them with a small 6 lug pattern.
