just found this thread...my
OHC is like av8tor stated above, it is a festoon type bulb, 1in long and 3/8in dia. use a coin to remove the contact cap thingy and the festoon bulb drops out.
In the ranger dome light like autodesign posted above, the map light I use a 921, it is way bright and has the 194 base. 194 is not bright enough for a dome or map in my opinion.
The dome bulb is a festoon type also, just longer than what is in the
OHC.
Now, I want to cross all these over to LED. looks like the
OHC LED bulb is in link above.