TLT Axle Question

[sparkycuda]

I've read the thread on Front Axle Options and it is full of great info. Current project - IH 350 Payhauler - has been delayed slightly to consider an alternative front axle size. I bought the RC Channel standard width axles based on truck measurements taken off a photograph. Now that the frame is built, the axle measurements were a bit off - I could make the RC axles work but would have to recess the spindle deep into the back of the wheel assembly - with possible steering knuckle interference.

So the question: what is the kingpin to kingpin distance on TLT axles? Total axle width is good, just need to know where the kingpins would be.

Thanks!

Ken