I'm pretty sure those are just regular old H6054 sealed beams. I just took a set out my car so they were handy to measure. I got the same measurements as you.
Further looking on the internets yeilded this link http://www.donsbulbs.com/cgi-bin/r/b.pl/1.15342078070206/h6054~usa.html
Yep, those are most likely H6054 sealed beams!
As a little aside, you can replace the sealed beam with a housing that fits perfectly. The housing takes replaceable/upgradeable H4 bulbs that will give you better illumination.