I measured last night and they are both 34". 34" is still the standard for larger trucks. 5th wheels, truck bodies etc. are all built for 34" frames. I have a 53 with a service cab on it and I recently got a 54. Both of them have grain boxes on them and I have never measured the frame width. The frame height on the 550 LCF and the 550 conventional is the same as the over the road trucks we use today so I will already have a glove for the splice. I may not even bother to Z cut it. I may just cut it straight and depend on the glove for strength. The gloves are 110,000 psi steel and thats a lot stronger than the old frames ever were.