For starters I don't want an amplifier or state of the art speakers. I just want speakers that work and might possibly have the same connectors to save me from having to buy solder, shrink tubing, etc.
I know the front door speakers are 6x4, tried pulling couple from a wrecked Jimmy but different connectors. Is there a way of telling what connectors my Blazer had based on the serial numbers? Or do I have to pull out an old speaker and match it?

 

I purchased some cheaper Kenwood speakers, 5-1/4". Like $40 for a pair.

I just stripped the wires and capped them together, and made sure to add some sound deadener to the inside of the speaker "hole".
Fit like a glove, and sound amazing.

 

If your still looking I would think your best bet would be Crutchfield, but I doubt if you'll find anything out there with the connectors you need.

 

I would cut off the stock connector, from yours or a set at the scrap yard, and buy some connectors from your local electronic store that fits your new aftermarket speakers.