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1930-1931 Chevy Headlights Read then decide.
Used to replace standard 32-50w 12v bulbs in '30-'31 Chevy headlights on ratrod. The "flange" that the press nut mounts to on the backside is a little short due to the flat base on the socket seat...since reflector is concave/curved mine didn't come out the backside enough to easily press on nut. Took some persuading and ingenuity to get mine on without damaging the reflector...then, when I got the nut on, it had "tweaked" the socket seat and made it near to impossible to get light bulb to install.
The base needs to be the same shape as the press nut...at least for '30-'31 Chevy headlights...I'm sure all reflectors are not the same shape and may work better for other models.
The instructions didn't state how to "clock" the bulb socket(unless I missed it)...low beam throws only to 1 side or half of the light...I mention that because if yours fits as tight as mine, you'll have trouble "clocking" it after install...and I'm using a painted reflector so it mattered.
*Take the advice from another reviewer and use the proper hole drilling tool to enlarge the reflector hole...if you're not familiar with drilling thin metal.
1 month since install and all is well.