1034A (amber) LIGHT BULBS

1157 is the heavy duty "equivalent" for the 1034. I'm sure Chineseoization has set it LOL

30 seconds later, gets back from a VERY quick egag search..........

NOS vintage Sylvania 1157A a pair

VINTAGE SYLVANIA Lamp PN 1157A 12V NOS 2 BULBS HOTROD, CUSTOM, MADE IN USA | eBay

Here's a whole box of Morrison, which I've not heard of
Box of 10 pack - 1157A NEW NOS Morrison Amber Turn Signal Bulb 12V32/3CP 1157NA | eBay