GOOGLE says this about the 912 and 921 bulbs...
COMPARE 912 and 921 BULBS SPECSThis shows the 921 and after you see its specs then select the 912 bulb from the selection for comparison...
You will want to compare the wattage and current draw of each bulb as compared to the specs of the LED 921 bulb you have.
Roy Ken
My Posts are IMHO based on my experiences - Words in CAPS does not mean I am shouting
Roy - Carolyn
RETIRED DOAF/DON/DOD/CONTR RADIO TECH (42yrs)
K9PHT (Since 1957) 146.52M
2010 F150, 5.4,3:73 Gears,SCab
2008 Starcraft 14RT EU2000i GEN
2005 Flagstaff 8528RESS