I notched my tail housings to make the sockets fit (flat file, 1/4" shaved, 30 seconds each, no problem!), but otherwise had the same idea. Going to the next level though, to get fully independent indicators, will involve a 2-to-3 converter like you find in cars pulled by RVs; the combination signal (yellow wire #43 & dk. green wire #48 on the BCM C2 connector [on 04 at least; later cars might differ]) would splice into the converter's combination input, and the dedicated indicator output will pick back up with the yellow & green wires, and the dedicated brake feed can either go into the white brake feed (#30 on the same C2) or run new lines to the back, though I'd go with wiring through the 3rd brake, as that'll keep the system from being confused when the 4-ways are on! Would love to have amber turn signals (like my '89 GP), but even the bespoke tail light shops can't be ersed! Modify Spyder LEDs? One thing at a time...
