I believe this is what your stock speakers look like(the plug):
This is what my '01 along with mynew '06 speaker plug looks like on the speaker:
Here's the plug you need for the plug on the above speaker:
Unfortunately, I could only find one plug in the 20minutes I searched in my messy shop. I know I cut 4 of them off of the P71 Crown Vic. I'm going to a couple junkyards tomarrow...so ill keep my eyes open and do a little snip snip, andthrow them in an envelope and send em to ya.
Just get the right plug, cut your old plug off, use butt connectors and crimp on the newer style plugs.