[Anachronism]

They are 'low profile' or 'mini low profile'

 

[Anachronism]

So would this add-a-circuit fuse not fit?
http://www.amazon.com/gp/product/B0002BGELQ/ref=gno_cart_title_1?ie=UTF8&psc=1&smid=ATVPDKIKX0DER

No, but a regular mini add-a-circut will.

I think this is the one I used - http://amzn.com/B004AHADOC