hey! I was wondering if anyone knows if i could run my aftermarket deck with stock wires in my 95 ls400...?

 

It's not so much the wires themselves but the plug which is obviously made to fit only Lexus stereo. Search the net for "stereo harness for 1995 LS400" or something like that. Then, once you get it, you solder it to your new stereo (which probably has only wires coming out of it and a schematic as to which color is what) and then your new stereo can plug right into your LS.
You should also ask around here what the deal is with various technical details such as ohms of your speakers vs your new stereo and where does your OEM subwoofer fit with all that (I've disconnected mine so I don't care, but most people do care).