This is the version without "X" ( 15°) for 5 speed gearboxes before 04/82 production; for 2 valve boxer models with 5-speed gearbox without "X" ( 15°)
Starting 04/1982, gearwheels marked "X" with 17,5 Degree gear teeth were used in the gearboxes. Previously, the teeth were at a 15 degree angle. It's important to check what version the transmission gears and shafts are. Since there are differences, the dimensions of these are to be rechecked prior to installation. 15 degree and 17,5 degree gearwheels are not compatible.
(NOTE: version with an "X" can be found in Related Products below.)