Having just rebuilt my mk2a, I discover that the values have drifted. I'm just about to go out to the car to test with the following values:

stalk_lhs=0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0x39,0x42,0x59,0x62,0x20,0x28,0x0b,0x14,0xff,0xff,0xff,0xff