Whelen wingtip strobes. Check the latest Spruce catalog. Comes with
the STC (if one is needed). When I had the fuel tanks out couple
years ago (SB for the fuel lines and such) I had the wiring run
to the tips, altho I didn't install the strobes at that time.

With the wiring in place, adding the strobes is very simple. Translate
that to mean *cheaper* since the lights themselves replace
the existing single bulb red/green light unit with the white strobe
& r/g position lights.