No FM. Conversion possible but expensive. I'll get back to you about your PM.
eBay item is period correct but expensive. Euro model so only up to 104 on the FM band. USA models better as they go up to 108 as per current specs.
Volvo used Volvo branded Mono AM/FM made by Blaupunkt. Not Frankfurt as that is a 3 band radio.
This one. Note is a USA one up to 108 but I don't know if they did a 104 version as well.
https://www.youtube.com/watch?v=emO9YbRAKzc