The bulb I took out of my spare Grande turn signal is a 6v 21 watt bayonet type bulb with the pins straight accross.
They are powered by the 6v battery, so 12v bulbs would make no sense.
The headlight is aCEV 6v 21w bulb.
Zipy has the headlight and tail light bulb, not sure of the signal bulbs though.
My signal bulb says K25601. The housing also says 21w.
You might want to try www.taillightking.com for those if Zippy doesn't have them
best of luck!
kbj