Just found a great supplier for bulbs rather than the local auto parts house, it is Candlepower Inc. out of Rockville Md, (D.C. area). The web page is www.candlepowerinc.com. You can shop by candle power, voltage, watts , etc. to find what you want. The support guy there is Ken. Picked up a box of the 10w, 6cp, 10 bulbs box, for $5.20 plus $1.49 shipping. (These are the tail light bulbs).
They have all the lamps you could want for the shark. New bulbs, in pairs at rear, get rid of that dash light warning. And that dash light says “Tail lights” means it’s checking all side markers, license plate, front parking and rear tail lights. So when you change them, do them all so as to balance the resistance. The “lamp check unit” compares one to the other and lights up should not all the same on that function. This can be seen, and traced, on the Electrical Lamp schematics (if it’s blown up the size of a card table).
Shipping is 1st class USPS from Ken.