7 1/4 suregrip rear end

not too sure of the present state of the rear end - i will one day bring it to a shop for a look at i am just getting myself educated - there are 7 1/4 sure grips out there it would be a matter of being lucky to find one - the cost of putting in a unit into my present rear end would be costly i am sure - auburn gere seems to be a candidate for the sure grip - thanks