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left (drivers) side is 1 and 3/8 inch measuring from the outside edge over to where the mount is.... the right (passenger) side is the same measurment. double check the holes that mount to the frame.... center to center is 45 and 1/2 inches, double check your frame to make sure they are the same. the mounts sit tight up under that factory firewall seam as in the pic.
First where did you get the cab mounts? they are not of equal quality, some are worse than others. another thing.... there is a right and left mount! they are not universal, maybe you have them on the wrong sides? you should put your cab back on to align everything.