i am restoring a '34 canadian gmc 1.5 ton flatbed dually (sp)...it has an open drive line w/ exposed universal joints...it is the only open driveline of the early '30s vintage i have seen and from what i can tell it is all original...no modifications...

does anyone have any insight regarding this design and know where i can find u-joints that fit...(there are no numbers on the u-joints)...will measuring the dimensions of the u-joints help...???...thanks all help will be appreciated...