[Spridgets] rear hub question

[Weslake1330 at aol.com]

How can you be sure the hubs are wrong?  Often the number cast (like  in the 
hub) is 1 digit different from the part number used.
 
I thought a single rear hub was common across the BMC range with only stud  
length varying.
 
Regard
 
W E S L A K E 1330
 
In a message dated 12/06/2008 23:01:59 GMT Daylight Time,  
leavcast at infomagic.net writes:

While  fixing a rear axle seal leak I discovered that I don't seem to have
the  correct hubs.  My parts book says I should have 2A7087 hubs and I have  
2A7088 hubs.  The profile appears wrong for the seals that I  have.

Three questions:
Any problem with using the 2A7088 hubs on my  sprite?
Who makes a good 2A7087 hub?
What was the 2A7088 used  on?

George Castleberry
59 AN5
54 BN1
Flagstaff,  AZ