4.5" bolt pattern 7.25" rear axles

Does anyone know all the models that have 4.5" bolt pattern 7.25" rear end axles that will fit the '69 a-body? Looking for the budget way to switch my 7.25 rear from 4" sbp to 4.5" bbp to match the fronts when I do disk brake swap. I went to the yard today thinking the '74 dart with /6 and 7.25" rear out there naturally had the bigger pattern, but it didn't. I started taking lug nuts off when something did not look right. So I measured them. "SOB!" Glad I didn't waste my time, energy, and money though (save for driving out there).

Is finding a '73-'76 a-body with front discs the only likelihood?...
It would be nice if an Aspen or 5th Ave axle would fit. There's a few of those out there. Thanks.