My thoughts would be up near the seat bracing at the front of the trunk, but if you're doing stereo equipment up there, then about the only other place I can think of would be the where you're describing. How much space do they require?
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Chris
1968 Camaro: DSE tubs and sub frame connectors, Chassisworks G-Link rear suspension, Speedtech upper and lower control arms, Chicane front coilover conversion with QA1's, Baer brakes, 18" Forgeline SO3's, Vintage Air, 6.0L LS 417 rwhp, 4L65E, Moser 12 Bolt w/3.73's.... http://www.cardomain.com/ride/2391864