Just saw this on his website
Q: What is the track width, hub to hub of the GTS kit?
A: The GTS kit has an adjustable track width. The actual track width varies from model to model (A, B/E, C etc) as well as which brake kit. Generally speaking, on an A body, it is adjustable from 59 to 61 inches.
spun bearing, mine measured out to 58 inches with about an 1/8 inch where I could go even narrower, probably as narrow as 57.75 or so, however right now, I set it to 58.5 to measure for tires/rims. Plus that is where the max suspension travel measured at. When completed, I'll be going back to 58 inches but I wanted to measure for the 58.5 setting because I plan to run wheel spacers as a tuning tool on this since it is a PT car. Just another tool in the toolbox for tuning.