So we're having a really hard time finding a sway bar for our 24 Hours of Lemons Valiant (see: https://board.moparts.org/ubbthreads/ubbthreads.php/topics/2076847/re-24-hours-of-lemons.html) that will keep us under budget. I was wondering if someone with an OEM bar could take some measurements based on the diagram below so I can scour the junkyard and see if I can find something that's close in size from something late model (pre 1980 cars are non existent in junkyards here).

Data I have based on some bars in my garage is below. However, I believe the A body unit I have is a '74 and there are variations to earlier bars that I do not have. I also have an added dimension in a straight line from your dimension A to C but do not have the overall width, dim C

70+ B and E body A=27" B=10.125" C=no data D=8"
pre 70 B A=27" B=19.5" C=no data D=17.5"
A body A=23.5"B=15.5" C=no data D=12.25

I'd love to get more info on other options out there as well.

GM F bodies and GM trucks may be options. You can always trim the link arm length down to what you need.

what year bar are you looking for? I've got one I'll sell you dirt cheap for a 73-76 a body

You are looking for a 67-72 a-body front bar, correct?

The 66-69 b-body bar is very close and just about 1" wider overall. End link bushing could be tweaked in lemons fashion to fit.

Do you have away bar tabs on your LCA's? If not you could fit a narrower bar eyelet to eyelet if the other dimensions worked. The aftermarket Hotchkis bar is like that. You'd loose rate, but that could be made up by a thicker bar.

I modified a Chevy truck front bar for my 70 Charger. The 70-72 B body K member has the sway bar passing through the K like the 73-76 A body cars. My bar is 1.25" solid and came from a 73-87 Chevy 3/4 ton or 1 ton 2wd. I just had to shorten the ends and drill to mount end links.
$20 or so for the bar and $15 for a guy to drill the holes for the end links.