Call Rapco. 1-800-527-2726. I'd be surprised if they didn't hold an
STC. They list an RA211CC as your pump.
http://www.rapcoinc.com/pdf/vac.pdf

170, 170A, 170B TCM O-300A
RA211CC

The RA2111CC is a very common pump.

-Robert

-Robert

gt wrote:
I would like to make my 1960 Cessna 172A IFR. Currently, I have only
venturi vacuum. My A & P stated that as there is no STC for a vacuum
pump intall, I need a form 337 field approval...I think it is form 337,
I could be wrong on that. Does anyone have information relating to
STC's and field approvals for vacuum pump installations on a
Continental 300-C?