[Radioroslyn]

Sets that use the 9.1mc IF for the FM band are not very common. 10.7mc was adopted early on and it became the standard. With your situation you could if you have the space near Z-302 to wire in a common 455kc replacement transformer. It doesn't necessarily have to be bolted in, lead length is some what important, and neatness is good. If I were doing it I would look for an IF transformer that has trimmer adjustments at the top as having slugs at the top and bottom may present an alignment problem after mounting. Drill a hole thru the chassis on center with the base of the replacement trans about 5/16" in dia for the wires to connect under the chassis. To mount the trans double side tape or zip tie is ok.