<<<snip>>>...ideas/brands/models tips would be appreciated...<<<snip>>>

My front speakers are Blaupunkt RL3524.  I origionally bought them in '92
to put in my '83 GTi, but they also fit my '92 Passat.  I think they're
3-1/2", IIRC.  Don't know if they're still available but it's worth
checking.  And here's how I mounted them...

The factory front door speakers are all one piece.  The grills for the
Blau's would interfere with the window crank and I really didn't want to
mess with that.  When I pulled the factory speakers, I noticed they would
accept the Blau's with a little modification.  I snipped the plastic
around the factory speakers, removing the grill portion from actual
speaker.  I them took a Dremel tool and ground down the plastic on the
back side of the grill where the mounting tabs on the speakers and the
grill mounting holes line up.  Using the factory screws, I then fit the
speaker behind the grill and screwed the whole thing to the door.  All
four screws line up with the factory holes and there's not interference
with the window crank.

HTH...

Alan Bosch
& Phred ('88 Wolfsburg)