Look anything like this?
http://www.talonix.com/images/WMF5.6.jpg
or is is rectangular/box shaped, like Belimiter Fuse Resistors?
The Belimiters were all merged into two RCA part numbers - one 5.6 ohm, and the other 7.5 ohm. Your RCA part number is one that was merged. I don't have my RCA guide here with the part numbers, but can get them if you need them.
Only replace a fuse resistor with another fuse resistor, or similarly sized (ohms/Current Rating) inrush limiter.
Cheers,