I installed 2 incandescent bulbs in one of my cars. They work fine. Positive brass base (not aluminum). A small minus. The contacts on the base are not as strong as in older American lamps. But unfortunately, lightbulb production in America has been largely wiped out by offshore imports. Even the bulbs at the parts store for $6 a pair aren't as good as the old ones.
12 Pack MR16 LED Bulbs 50W Halogen Equivalent - 5W GU5.3 4000K Neutral White Non-Dimmable 45 Degree Beam Angle For Landscape, Recessed & Track Lighting
39 Review
6 Pack ST58 Antique LED Edison Bulbs 60W Equivalent, 2700K Warm White, 95+ CRI Non-Dimmable E26 Medium Base Vintage LED Filament Light Bulbs
34 Review
π G9 Ceramic Base LED Light Bulbs 4W Warm White 3000K - G9 Base Bulbs, Equivalent to 40W Halogen, 450LM, G9 Warm White Bulbs for Home Lighting, Pack of 5, Non-dimmable
29 Review
Antique 40W T14 Incandescent Light Bulb With Medium Screw Base (E26) By Bulbrite
35 Review
20 Pack 5CCT 4FT LED T8 Ballast Bypass Type B Light Tube, UL/FCC Certified - 18W, 2300Lm, 3000K-6500K Selectable
21 Review
Set Of 4 Geeni Prisma Wi-Fi Multicolor LED Light Bulbs, 1050 Lumens, 2700K, Dimmable, No Hub Required, Compatible With Alexa And Google Assistant, 75-Watt Equivalent
41 Review
Illuminate Your Space In Style With I-SHUNFA'S Stained Glass LED Light Bulbs - Perfect For Home, Parties, And Festive Occasions
14 Review
Luminescent lamp Camelion 11066 ultraviolet, E27, 26 W
12 Review