Gents,

Thanks to all who replied.

The Polk db 525's I chose for the rear did not fit in the stock location. The hole would need to be enlarged. I do not have the correct tools to make this happen, so I went with 4" Infinity's instead.

I think the confusion about the 5.25" fitting in the rear stems from the fact that not all 5.25" speakers have the same cut out diameter. The Polks I attempted to install has a cut out diameter of 4.75" while the Kenwood Excelon's Denis installed has a cut out of 4.5". I guess any 5.25" would fit without modification to the hole diameter as long as the cut out diameter is smaller 4.5".

ADC

If your looking to put a little bass in the trooper, here is a good article form Isuzusuv.com's "how too" page.
http://www.isuzu-suvs.com/howto/trooperwoofers.html
and if your still interested in 5.25's
http://www.isuzu-suvs.com/howto/troopspeakers.html

(I ended up doing some creative cutting to fit some 5.25's in the rear of my troop.) <img src="/forums/images/graemlins/kewl.gif" alt="" />