[19Fordy]

Burly: These are the Monroe shocks that were used when original 40 shocks were converted to tubular years ago in 1963. The rear shocks are the same as for the 1951 Mercury. First number is closed height. Second number is extended. Measurements are center to center of eyelets. Here's a handy calculator to determine the compressed length and extended length of the Monroe shock you need. You have to play with it so be patient. Call them to be sure you selected the best fit for your car.
I found shock # 34905 to be close. (12.65 in to 19.75 in.) When using the calculator (below) I selected "chassis" for Vehicle Suspension and then individually plugged in "Class 1 through Class 8" for Vehicle Class to see the various LOOP shocks available for each class.
http://www.monroeheavyduty.com/catal...nsional-search