Hello DJ

Hope this might help with the front ones.
http://www.minitrailers.com/Frameset.htm
As for the rears I think the standard holes in the rear shelf are 6", I
bough a pair of 6.25" speakers that I liked and used a pair of 25mm thick
MDF spacers cut out by my local timberyard to raise the speakers up just
enough so that I wouldn't have to cut the existing shelf liner or metal.
Doing this would mean you could have almost any speakers you want.

Hope this helps

Karl

David Jordan (ng) wrote:

In my 61 850 i installed a Rokee dash board with the holes for the
vents. The 61 dosnt have vents like the later models so I installed
speakers in the holes, and installed sub woofers under the back seat.

    J

I just bought a set of Pioneer TS-A1681R speakers - I did a fair amount of
research before buying, and am very happy with the sound quality.  The back
shelf metal cutout was large enough, but I had to remove the fiberboard
shelf and cut it larger since the previous speakers were like 5" or so.

Geoff