there should be two metal brackets at the bottom of the lumbar portion that are held in place by a bolt on each one. at the top of the lumbar, there are three compression clipse the prongs are pointing north and south. you will need a pair of needle nose pliars to compress them and pull the lumbar away before releasing. give the c pillars a solid pull (not jerking them or pulling on the unevenly. with the lumbar removed, you will notice that the rear deck is held in place by two body clips. they would normally be covered by the top of the lumbar. After you do this, pull the rear deck up and out. My last peice of advice is to consider mounting the speakers from underneath. This will make any future installs very easy.
THIS IS MY BONNEVILLE. THERE ARE MANY BONNEVILLES LIKE IT, BUT THIS ONE IS MINE
WITHOUT ME, MY BONNEVILLE IS NOTHING AND WITHOUT MY BONNEVILLE, I AM NOTHING...
Black 2001 SE Grey Leather Interior: