As Gary has pointed out, there are several good choices. I suggest you review the Whelen Aviation catalog for the various possibilities.
http://aviation.whelen.com/A drop in strobe such as the HRCFA series is the easiest strobe installation you can get, just remove one and install the other. Most work is insuring good grounds and power connections and doing the paperwork.
Another possibility is the 70509 Halogen flasher mounted using the 50519 adapter. This is not a strobe and is more like the flashing light used on "later" Cessnas (later than yours).
Another possibility is the use of the H103 adapter and mount a A470A series strobe head with a remote power supply mounted behind the baggage compartment. You could do this in conjunction with wing tip strobes.
Poke thru the catalog and then go to a distributor site such as Chief Aircraft parts or Aircraft Spruce and see what they suggest and handle.
Some of your consideration on lens color red or split red white or all white (not good for nite) light output and coverage requirements will depend on your national regs which I suspect mirror the US requirements.
Charles