Here's my stock of #5 series spindles, quantities in parentheses:

5N (10)
5P (1)
5R (8)
5S (1)
5SS (9)
5T (8)
5U (8)

Also have (3) spindles marked 7 with overall length of 123mm

Also have (2) Shimano Octa Joint spindles for the early 1980's Altus/Selecta cranksets.