Up for sale here is this set of 2 NOS vintage Sprague Black Beauty yellow-letter capacitors.  These are marked .05 uf 600v and test around .061 uf, with very low leakage/ESR, so they will work fine at full voltage.  They are probably too big to fit in most guitars.  These are early Black Beauty caps, but they are not PIO caps. Please see my pictures for details.

US shipping and handling is $5, and international is $18, no matter what quantity you buy. All my small parts are set up for combined shipping, so just use the "add to cart" feature and then check out all at once, and it will combine shipping. If you have any questions, please ask.

I have more capacitors and other vintage electronics listed--feel free to take a look!