Fabian, I have a spare belt for our 2003 SRT-10...with A/C...still in MOPAR package dated August 2004...part number 05037206AD in my "parts closet".
Sadly, the only thing that I have handy to measure it with is a flexible plastic tape measure so I cannot swear to the accuracy. I measured along the OUTSIDE of the belt (NOT on the ribbed side) and I read 67.75 inches on my first try and 171.8 cm on my second try.
I HOPE that this helps !!