[murf]

Hi Guy's,
Picked up a nice old Pilot FM converter along with a very nice Zenith 6S254 radio.
The two are paired together with an RCA jack.
What I would like to do is get an adapter to go from the RCA jack on the radio to a standard 3.5mm female  so I can also plug my Iphone into it.
Plus then I could use the Pilot on any of my radios which I have already installed the 3.5mm jacks on.
Problem is, the 3.5 mm jacks as well as the male to male cords that you buy for your I phones or whatever are set up for stereo with a red/white and ground wire.
Is there a way I can hook up the Pilot cord to work with the 3.5mm jack, or do I have to add an RCA jack to my old radios that I want to use the Pilot with?
Never been impressed with the performance of the 3.5mm jack and Iphone or whatever  as compared to the Pilot performance.
Trying to go from mono to stereo I guess.
Any suggestions?
murf