You can find these at Walmart.  I used them for D pillar AC and and the large fuse on the left A pillar. No over heating now. 
Bob

1986 Syncro ‘Bullet’
1991 WESTY ‘Sylvan’

> On Aug 4, 2023, at 14:38, John Rodgers <jrodgers113@gmail.com> wrote:
> 
> In the D pillar the 50 amp AC Fuse blew. Went to install a new one only to
> discover the original overheated before it blew and melted the
> rubber/plastic that holds the brass screw holder which in turn holds the
> fuse in place. It is PART# 251937501B and is NLA.- It's been discontinued.
> Would anyone have one of these or know where I might find one?
> 
> Royal Volkswagon  here in Birmingham, a dealership, was a huge help in
> tracking down this part number and finding a parts blow-up of this
> and sending me a copy.