Tim the data books would indicate this version is the accessory for 1947-49. The version I have appears to be correct for 1950 thru 1953. They are very easy to date as the glass bottle has a two digit code cast in the bottle bottom, mine shows 50.
https://www.flickr.com/photos/advance-design_parts_co/14090407790/in/album-72157631868452754/
Then as described the 54-55 1st Series has a different version as shown. This has two nozzles and the redesigned foot pump.
https://www.flickr.com/photos/advance-design_parts_co/44122209914/in/album-72157631868452754/
Some good detail here on the installation.
https://www.flickr.com/photos/advance-design_parts_co/44122208674/in/album-72157631868452754/