Center housing 01E 301 211 C   on left, 01E 301 211 B   on right. The boss used to bolt on the ProConTen guide is located just between the word Procon and the "10", sort of under the letters "on" of Procon. You will note that this boss is not present on the 01E 301 211 C   housing to the left. The bump in the casting that accomodates the wider 1st gear is somewhat larger on the 211 C   casting. You can see this bump clearly on both housings. This is a larger view of the same picture, without the writing. You can see the ProConTen mounting boss a bit better in this picture. This information and pictures copyright © Charles Smith, 2002.