I've got an 83.5 Westy and am in need of the expansion tank cap. VW dealer
says it's no longer available. Can I just go with a generic Stant type cap?

This expansion tank cap is metal looking like an old Chevy radiator cap and
was used in early water-cooled gas engines--in fact I think this set up was
only used for a few months before VW went to another expansion tank design of the
type that utilizes that elusive H plastic pipe and a green plastic cap. The
expansion tank part number is 068 121 405D. It's for the 1.9L. The cap I need
lists as part number 025 121 321.

Once I get the cap can I replace it with the engine cold and NOT need to
bleed the system?

Thanks
Jeff
83.5 Westy
LA,CA