The decal set i bought had instruction/template with it. I think I got it at Dante's. There are usually sets of side GTX emblems on ebay all the time.

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Love them 68 MOPARS! GTS 340 auto, Charger R/T 440 4-speed, Superbee 383 auto, GTX 440 auto, D100 (new front frame 5.7 hemi - in process), Formula S 340 4-Speed A/C (it's green), 383 auto Roadrunner (maybe a hemi - waiting) and a 68 W200 Power Wagon. Drivers: 07 Cummins and 14 Ecodiesel 4x4.