Well, this was posted in the Q+A...
Q: Update 04 gave Terminal Supply as an alternate for the Maxi Fuse Block. TS said that the Maxi Fuse Block JEF-531-D is on back order. Is there an alternate for the alternate?
A: If you are looking for a spare, Terminal Supply should have more by the time our regional events begin. There are other distributors, such as Stinger Electronics (
www.stingerelectronics.com) that may be able to direct you to your nearest retailer.
So, it looks like the stinger fuse holders are OK to use.