The pictures were confusing, but seeing your other comments, as well as other posters, it makes more sense what you are asking.
For the Model 2 and 3 radios, that don't have the internal speaker, it's common to have the speaker leads coming out of the 25 pin connector on the radio to a matching Molex type connector on about 6 inches of wire. You'd connect your external speaker there. Looks like someone either cut the leads off, or you got the accessory connector from a Model 1, etc….
Using the proper pins to make the connection on the 25 pin connector is recommended. It might be easy to find something that can jam in there and work, but messing up the connector on the radio end isn't something you want to do. Since they are regular DB25 connectors, you should be able to make this work with parts from Radio Shack, or just find the connector with the speaker leads already installed.
You can purchase pre-made cables from E-bay:
Cable 235 Speaker Ignition Motorola MCS2000 HLN6412 | eBay
E-Bay user MRE1032 has been around for a long time and is a trustworthy seller. I've purchased from him before with good results.