While working on individual Part Numbers tech pages, Iit became obvious that there was no easy accounting for the subtle nvariations among all the different models and part numbers for the MGA rear wheel bearing hub parts. So start with a quick summary,to be followed by a list of all the part numbers.

The factory part numbers for the rear wheel bearing hubs include the pressed in studs, so there are no factory part numbers for the bare hubs without studs. But there are replacement part numbers for the studs. The studs are shorter for wire wheels, otherwise same hubs. You can get steel wheel hubs and change the studs to convert them to wire wheel hubs (or vice versa). Find the factory part numbers tabulated farther down the page.

Installation for disk wheels will have a large steel spacer ring inserted to bear against the outer bearing race (both pictures below), and the half shaft flanges bear against this spacer. Disk wheel Splined hubs have a machined step at the inboard end that occupies the same space, so the spacer ring is not used with wire wheels.

MGA 1500 disk wheel rear hub

MGA 1600 disk wheel rear hub

Very early production hubs did not have the groove for the rubber O-ring, only the paper gasket for sealing. Later 1500 type hubs have a three sided groove for the O-ring gland (above left). 1600 type hubs have an "L" shape gland, slightly smaller on the bore OD, with the ID of the O-ring bearing against the spacer ring (for disc wheel cars), or bearing against the step of the wire wheel splined hub (above right). The final gland space is the same cross section, and O-rings are same cross section. The slightly smaller diameter O-ring for 1600 can be stretched slightly to fit and work well in the 1500 type hub gland. As such, current parts suppliers may only sell the slightly smaller 1600 type O-ring, cross referencing it to be used also for the 1500 hubs. Find more information on original and replacement type hub sealing rings in a following article RA-103.

Be aware that some current vendors maybe selling the bare hub without studs (maybe only one model), while listing it under one of the assembly part numbers. And they may state that other hub part numbers are not availabe. But all of these hubs are physically interchangable, if you install the correct studs for the application. With the studs removed, the only difference is style of theO-ring gland, late, early, or nil (very early). Picture at right hows a 1600 type hub with the "L" shape gland for seal ring, and no studs.

Early MGB hubs ('62-'67) are similar to MGA 1600 type hubs, but have larger diameter wheel studs (1/2" vs. 7/16"). But that should only be of interest if you want to change the thread diameter of the rear wheel studs (various reasons and discussion for another time).

Now on to tabulation of the part numbers:

Hub Style	Asssembly No.	Studs Needed	Nut for stud
Early 1500 w/ DW	1G7433 ?	1G7435	ATB7074
Early 1500 w/ WW	ATB7208 ?	ATB7201	FNZ507
Later 1500 w/ DW	1G7433	1G7435	ATB7074
Later 1500 w/ WW	ATB7208	ATB7201	FNZ507
1600 type w/ DW	ATB7352	1G7435	ATB7074
1600 type w/ WW	ATB7391	ATB7201	FNZ507
T/C & "Deluxe"	ATB7246	ATB7249 For hub	ATB7268
T/C & "Deluxe"	ATB7246	ATB7248 for rotor	ATB7268

? I don't have the very early SPL showing assembly numbers for early hubs with no O-ring.
The Twin Cam and "Deluxe" cars also had no O-ring and a different paper gasket.
First line for T/C shows stud for hub extension and pinnacle nut.
Second line for T/C shows stud for brake rotor and pinnacle nut.