Engine oil dipstick

[kmack3211]

Can anyone help out with the right part number for the dipstick on my '79 337H. We have ordered the replacement from 2 different suppliers and both sent the same length dipstick which is too short to even register any oil. Compared to the front dipstick the replacements are 4-6 inches too short. The part number we are using is a TCM number which is 632062-20A1. Any help would be appreciated.