Will a Bose radio out of a 90 fit into a 88 Coupe ?

Yes, but not the all speakers, will not give you good sound, buy new cd/mp3 player cost less, bettr.

I just try it a 90 legng ls Bose radio on my accord, fitted perfect, but hardly hear anything, volune are very low, due to LS model is runs a seperate audio wire to all the speaker, which the L model doesn't equipt. unless U have a 88 LS. hope this help