I agree NA - think it stems from the Gates own site where it shows the same belt for the EGX and EGZ engine.

This might help a bit - seems that some MB parts are less in price to Chryslers

CHRYSLER 5143206AA
MERCEDES 1129970092
ACDelco 8K1145
GOODYEAR 4081145
NAPA 25081145
GATES K081145
Outside Circumference :2924.18 mm,115.125 in
Top Width :28.45 mm,1.12 in
Ribs :8 mm,8 in