The standard OEM incandescent bulb is 7443 and you can find many 7443 LED replacement bulbs anywhere. ALL 7443 are dual "filament" bulbs, meaning they operate as dimmer (8 watt) running lights and brighter (28 watt) turn indicator lights. I think the OEM bulb is clear and not AMBER since the lens cover is amber.

Some GL's rear lights have been modified so the turn indicators also go RED with the brake light. If the only "conversion" was changing to LED's then almost any LED bulb will work but I'd suggest looking at the installed bulb that's not working for a maker and model number.