Diagrams:

Numbers
(click to enlarge)

A7297	57-62	CASE - rear end/open, non posi, casting #3725899/reconditioned		CALL
A7271	57E	"NO X OR P" CASE - rear end, posi GM casting #3743833 / CALL FOR DATES AVAILABLE - USED ONLY IN DECEMBER 1956	1295.00
A7272	57M	"X" CASE - rear end, posi GM casting #3743833 / CALL FOR DATES AVAILABLE - USED ONLY IN JANUARY THRU MARCH 1957	1295.00
A7290	57	"P" CASE - rear end, posi GM casting #3743833 / CALL FOR DATES AVAILABLE - USED STARTING IN APRIL 1957	1295.00
A7291	58	"P" CASE - rear end, posi GM casting #3743833 / CALL FOR DATES AVAILABLE	1195.00
A7292	59	"P" CASE - rear end, posi GM casting #3743833 / CALL FOR DATES AVAILABLE	1195.00
A7293	60-61	"P" CASE - rear end, posi GM casting #3743833 / CALL FOR DATES AVAILABLE - October 1960 was the last usage for the 3743833 case.	995.00
A7294	61	"P" CASE - rear end, posi GM casting #3789812 / used November 1960 & later - CALL FOR DATES AVAILABLE	995.00
A7295	62	"P" CASE - rear end, posi GM casting #3789812 / CALL FOR DATES AVAILABLE	995.00
A2332	58-62	TAG - round metal, "Limited Slip", for rear end	16.25

Cases: Posi-Traction & Open/Non Posi