Hi,
the easy way is to buy at hobby shops a very small can or bottle of clear amber paint and paint the clear bulb...
a small tin of model paint will do probably 10-15 bulbs....
and they are inexpensive...... to purchase... even BIG W sell it....
I have seen bulbs already painted or dipped with amber paint at Auto One. Whether they had the straight pins I don't know....
I have over the years used the offset pin type and pushed in one pin with multigrips or pliers and then just use the one pin...
Lee Noonan 68AutoBug
http://community.webshots.com/user/vw68autobug