Ron wrote:
>I've been working on this issue since the above post from May 3, and
>have obtained a few of each cap - the earlier style and the later style
>- from a small German company. The difference between the early and
>later style is the thread pitch.  However the supplier doesn't know
>exactly what year the change occurred, other than to say he believes it
>to have been 1986 or 1987. None of my resources list it either; in fact
>the part number doesn't even come up anymore because it's been
>discontinued for so long.

Ron, I have a '84 and a '86. Both use the same cap.
It looks like aprox. 34mm thread diameter, and 3mm pitch.

Steve
'86 Westy "Escape Pod"