I just had my tail lights apart yesterday to look at this and the bulbs are cheap "921" bulbs I think the most wattage you can get these in is 15 watts. Alot of people have put auxiliary lights in the back to help with the dismal lighting and tinted window. Ill post here if I come up with a plan JC Whitney sells 50 watt 1157 bulbs that don't have a big head like a normal one so maybe spice in 1157 holders from an auto parts store??

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Kevin
00' Super Black SE 5 speed
31" BFG M/T's, ARB, Rancho RSX's
superblackxterra.tripod.com