Here is a link I found for bolt patterns. I think that the Transport Wheels use the 6X5.5 Pattern.
http://4wheelcustoms.com/BoltPatternGuide.htm
Out of curiosity, could you just do an axle swap from one of the newer Suburban/Avalanche 2WD Yukon & Xl/Denali 2WD Blazer/Tahoe/Escalade?
I apologize in advance if this is a poor question.
One other thing I noticed is this sticker on the wheel that says that it is not intended for extended use, which is a little worrying. What are these things intended for anyway?
http://i213.photobucket.com/albums/c...psw6yquk84.jpg