I have the Clarion system and they do take the 4" speakers. I have the Wally World 3 way speakers and they are slightly too big. I would think any 2 way speaker would fit though.Sorry tg, I may be a little off. Just noticed you have an 83' 1100. That probably has the clarion system so I don't know if a regular set of 4" speakers will fit. Someone else with a bike that year may offer up some advice.