Wow...$50 is a great price for a roadie!
The Roadstar II series had two styles of bridges. THe Deluxe's came with AccuCast BII and the Standards a more basic tin style. Factory replacements are available through most Ibanez dealers. Part numbers below
If you have a RB Deluxe (Gibson- style headstock)
Bridge & Tailpiece
Parts No. /
2AC1B25B

Color / Voltage /
Description /
BRIDGE/BK ACCU CAST B25
Note.
B25 / Black
And if you have the Standard (Fender- style headstock)
Bridge & Tailpiece
Parts No. /
2BB1B15C

Color / Voltage /
Description /
BRIDGE/C B15/5ST STOPPER
Note.
B15 / chrome