The teardrop / banana shaped ones only came on the North American 1972 & 73. I know where to get a set, but they have a cracked passenger lens. Since my car has always had them, I've never even searched for the parts. I think Rowdie said he has some lenses, and would be interested in the ones with the cracked lens. I have no idea the next time I'll visit the guy who has teh cracked lens turn signals.
If you are just looking for turn signals, then you could put any old electrical box crap on there, but I'm not sure why you'd want to do that. I'd probably argue to modify the side marker to operate as a turn signal instead of doing that... but then there's no turn signal that would be entirely visible from the front.
On the Euros I installed, they don't operate as side markers, just turn signals. I'm not sure if I'll need side marker lights to pass inspection here. I've got more than another year before I need to worry about that.