Are either or both of these following products equivalent to the above? : AC Delco Axle Lubricant SAE 80W-90 GL-5 10405-1 89021669 and GM Vehicle.Care Axle Lubricant SAE 80W-90 APL GL-5 89021669. If so, are these two products the same as one another? I own a 1987 Morgan Plus 8 with an unobtanium Salisbury LSD rear axle, so I cannot make a mistake in using a successor to 1057721. I want to use the correct product, one of these two or something else, with ACDelco Limited Slip Axle Lubricant Additive 10-4003 88900330. Any knowledgeable guidance would be appreciated!