[email protected] wrote: I have two clear plastic castings or covers that say (molded in) "SPARE > FUSES". 1-1/8" x 3-1/2" x 5/8", hollow box with reinforced hole in middle... Sounds like SP-600. Mine has "2034195" molded in. Al -- Al Klase - N3FRQ [email protected] Flemington, NJ 08822 Web Page: http://www.webex.net/~skywaves/home.htm