Good Quality 501 Bulbs push in capless Bulb Fit Most vehicle 12v5w | eBay
2) Push In Style Light Bulbs - Part # 2PCW – Central Michigan Sewing Supplies Inc.
Push Fit Energy Saving PL lamp - 9w/11w 2G7/G23c | eBay
Amazon.com: ID: 2PCW. 2 New Generic Clear Push-in Light Bulbs, 120V-15W, Compatible with, not Manufactured by Singer. Will fit Models 15-66, 99, 201, 221-222, 401, Plus Others as Below
Truck City Chrome & Parts - Amber Push In Replacement LED Light Bulb (13 Diodes) - 2 Function
Led Light Bulbs For Singer Home Sewing Machine 1w 220 Volts Push In Type # led-ba15d 220v - Sewing Tools & Accessory - AliExpress
2-Pack Sewing Machine Light Bulb Double Contact BA15D Push in Bulb Daylight White 6000K 15T7DC Base Replacement for Singer ,Kenmore Sewing Machine Light Bulb Bayonet Type Replaces #6797 and #6810 - Amazon.com
Amazon.com: LETAOSK 5Pcs 220V 15W BA15D Light Bulbs Fit for Singer Home Sewing Machine : Tools & Home Improvement