mancini racing has them.
I run them on my valiant with 3000lb ss springs. they will drop you 1 inch.
consider you may have to do a 'cut & roll' on the rear end to get the pinion angle correct, as in cut off the pearches, buy new ones and weld them on after rolling the rear to obtain the correct pinion angle.
snug down the u bolts and lower it down to check before final weld.
