1034A (amber) LIGHT BULBS

1034 and 1157 put out the same amount of light. 1157 has a much longer lifespan, and draws a little more current, so you have to match the turn signal flasher to which kind of bulb you're using. 1034-type flasher with 1157 bulbs = too fast, other way around = too slow.

Sounds like what you want is the bulbs that look like they were painted with leftover school bus paint, rather than the current transparent amber ones. Old stock bulbs are around. Those were 1034A or 1157A. I don't have any. I think Old Car Parts Northwest has some on shelf. There was a guy on Fleabay selling new-production ones; don't know how good they are (or were), but I don't see them any more. If you strike out at OCPNW, old-stock ones go by on eBay all the time, like here and here.

(they started using "NA" for Natural Amber, 1157NA/1034NA, when they came up with the transparent tinted glass, but then they figured out how to make a transparent amber coating and some companies went back to the "A" designation for those even though they look like the transparent-glass ones rather than the painted ones).

You won't get any paragraphs from me about aesthetics—you might get a squawk from me if you do (or propose doing) something unsafe.