i tried to get a good meas with a stock tube-the stock tube has a rib on it, and seats down in a rubber seal, which sticks about 1/8" above the "boss" or tower that it fits into-i got a pretty close meas, which if you meas down from the top of the raised part or boss, minus the seal (its aprx 1" above the case) 2" just about puts you on the money
not sure what the Lokar looks like, prob has an o ring and a rib it stops on
hope i didnt make it sound confusing, just meas down 2" from the top of the raised area where the dipstick goes in, ck that against the fill mark on your dipstick