Receiver wires ripped out of plug

Astroflex 310-103-104-01 Brain Receiver FCCID: J5F-RX120 (Not sure which number to reference this with) Pictures of plug, Brain and Receiver attached. Hey there, I am new here, but need help with a Astroflex (Astostart?) Remote starter in my girlfriends 2000 Dodge Caravan. The installer installed it so tight it pulled the wires out of the plug over time. The plug looks like the picture attached so I don't think I can rig it to work again. Can I buy the receiver or wire somewhere even though the equipment is ancient? Maybe you guys have tips on how to fix it for now. Also: I have another Astrostart starter I bought for my grandpa which I could put in, then buy him another. I haven't installed one before, but the wires I need should already be run to the current brain for me. Maybe I should just put in the new one? If so which connection method should I use to connect the new harness to the old wires? Butt connectors seem bulky and might pull apart in time and soldering is quite a tight space. Your suggestions are hugely appreciated. Thanks! -Shawn

The part that pulled out of the plug is under the dash by the way.- Shawn

That is a pretty old product. If you can find an old dealer you might be able to find product but I doubt that you will be able to buy it from the manu as it is over 10 years old. Best bet would be to install a new system. If you have a newer system the wiring should be fairly close. Soldering is always going to give you the best connection.