The factory E-body bars are straight in the middle.
That is an A-body 73-76 sway bar if it came from a mopar.
IIRC, I've measured a 73-76 sway bar hole to hole distance before. Or commented on someone that did. So, try to search my username (autoxcuda) and sway bar measure width. Try to google search that too.
Sorry I'm not around my 73-76 sway bars right now. Possibly tomorrow night.