I'm trying to find the color, too. I have a 46 and a 50 E-3 but my FIL had them both repainted red. I have a spare governor housing with real clean paint that I'm going to try to match at S-W. I'll post if I get something.
I went to a S-W automotive paint store. Came up with a real good match in Advanced Industrial Coatings (AIC) brand #48855 from their universal color line. I used the rear engine plate from my E4 for a sample. There was some paint across the top of the plate that was well protected under the clutch cover. But it's a '51 so may not be the same as your '47.
