There are four on the outside of the load bank two are cracked. Prob will have to cut them down 5" is common but just scored a diamond blade for $10 for the Makita so I should be able to cut them now.
sisweb.com has 1/2" OD ceramic insulator in up-to 24-inch length and will cut them to your spec. A little pricey though: They have 6" length pre-cut single-hole ceramic standoffs advertised for $13.50 apiece.