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Dipstick lengths are sometimes posted in the appropriate chassis parts catalogs but not always. The 8RT has a rear sump that is deeper than the Mercury pan since they are for trucks. The Ford 8BA car engine is a center sump pan. You then have the shallower rear sump pan of the 8CM Mercury cars of 1949 thru 1951. They all changed again in 1952 for the EAB series and 1953 for the F100 stepped pan.
8RT-6750-B = 17 7/8"
8BA-6750-A = 18 15/32"
I believe these to be overall length. The tubes that screw into the pan boss have to be the correct length as well. This info comes from parts catalogs. Follow the 5 quart rule with some in the filter to find your full mark for adapting a new aftermarket dipstick.