If you just want to try out a headlight to fit the bucket. Just ask for a headlight for any 1970 Volkswagon Beetle or maybe a 1972 Datsun 1200 or 1975 B210. They all take the exact same 7 " replacement light unit.
If it fits the bucket, then see if they can get you the Bosch unit. The Bosch 7" refelctor and lens assembly uses standard H4 bulbs and will give you a much better beam than a sealed beam unit. Plus the glass on it is much thicker and will not break as easily as some of the other makes.