The 2006 SRT-6 does exist in both convertible and coupe form. I do not have production numbers.

The 2006 SRT-6 did not get the proposed side badges or body colored windshield trim.

The 2006 SRT-6s came with the SRT TRACK EXPERIENCE (XPYS) at no charge.

The 2006 SRT-6s lost the HEADLAMP OFF TIME DELAY (LHDS) and HALOGEN PROJECTOR W/DELAY HEADLAMPS (LMTS) features. Instead they received the standard HALOGEN HEADLAMPS (LMAS).

The 2006 SRT-6s were available in MACHINE GRAY CLEAR COAT (P17) which replaced the 2005 GRAPHITE METALLIC CLEAR COAT color (PDR).

EDIT: Looking at the photos, it appears these two colors may in fact be the same...