[undy]

Don't know about ERA, but the SPFs run 4 1/2" back spacing in the front and 4 3/4" back spacing in the rear using Vintage's 17" 5 pin offerings. My LSC uses 5 1/4" front and 5 1/2" rear backspacing with Vintage's 5 pin, 17" knock offs. They're all using back spacing as their point of reference, not offset. I'm pretty sure if you talk to Bob @ Vintage he'll know off the top what backspacing's needed for the ERAs.