Part Number: 29400219
Fits '16-'17 FXDLS and Softail®, '14-'17 CVO™Softail® and '14-16 Touring and Trike models equipped with Screamin' Eagle® 58mm Throttle Body
The backplate is probably a year old, the filter element was just replaced by Harley less than a month ago since they said mine was “unserviceable” asking $150 shipped

 

pm set

 

So I checked my throttle body (Part # 27685-11A) which is stock 50MM. They make two of these ventilators, one for a 50 and one for a 58. What is the part number on it?. If its the correct one, Ill take it.

 

29700-09 is the number on the backing plate.

 

 

FWIW, I just bought this breather new... and an extra back plate, because I modify them to do external breathers. My bike (16 RGU) has the stock 50 mm throttle body so I bought the HD#2940017 breather which is the 50mm. HD#2940019 is the 58MM breather. Difference is the hole size in the back plates for matching up to the throttle bodies.

So the back plates I got are HD#29763-09, I have one of them sitting on my desk right now. It also has that exact same number stamped on it, but the rest of the markings are not the same. (mine doesn't say "Harley Davidson Motor Company" but has the HD logo and the "e4" logo as well as two other logos in that same area)

The fun stuff, the hole in the back plate for the throttle body, on my 50mm back plates, measures almost exactly 2 1/4" side to side.
So the 58mm should measure about a little more than 2 1/2".

This can get confusing because converting 58mm = 2 1/4". The 50mm back plate's hole measures 2 1/4". I believe this is because the throttle bodies are measured by the throat size, not the size of the flare at the end where these back plate mount.

Measure the back plate's hole for the throttle body... 2 1/4" would be for the 50mm throttle body or a bit over 2 1/2" will be for a 58mm throttle body.

 

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