I have several sets. C-bodies and trucks usually had them. I have them on my 72 SSP 440 with disc up front. Real happy with them. I've never seen a 11x3 on the rear, just on the front.
72 Satellite Sebring Plus 440, 72 Dart 5.9 4-spd, 68 Valiant, 73 W200, 78 D100 sb, 78 D200, 98 DAKOTA, . Moparmarks Parts & Restorations Desert Mopar Metal Grand Jct. CO 970-261-7039 http://moparmark.com/ motormangj@gmail.com