Doing a parts search on the ETKA CD gives:

---------------------------------
        025 121 321 A   cover

You could use the following

        025 121 321 B   cover
---------------------------------

The drawing only mentions 321 B however.

That's all I could find.

�ric

At 12:51 PM 31/05/00 -0600, Gary wrote:
>I just bought a new radiator cap (coolant tank cap) for my 87 from the
>dealer.  The new one is blue colored, the old black. The last few part
>numbers on old one is 321A, on new one it is 321B.
>Anyone know if VW made a change of spec?  Different release pressure?
>Just wondering
>Gary