I may have a big car dipstick in my box of nailhead parts--I will look tonight. Easiest way to do it is to cut a calibrated amount out of the middle of the dipstick, then weld it the two halves back together. No re-marking required when you do that. They are about 1/6" thick material, so welding is no problem with a mig. If I have one, I will make one up for you and and sell it to you cheap. I can use the one from my car to go by for the length.