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Best ones I've seen and used on two of my own bikes are from the Buell Ulysses, made in Italy. Very flexible. If you can source them from a Harley dealer over there, they were relatively cheap here at $15.99 each, a total of about $64.00 for four.
The ones on the right with the short stems, for the rear. Uses a common car flasher relay. Inexpensive automobile 3w single fillament bulb. I have a set on my KLX650 and also on my Zephyr 550.
Local dealer here in Columbus Ohio area had a few in stock, parts guy said they sold a fair number to dual sport riders. I see why, price/quality/flexibility.