These are the Farmalls that were available on factory LPG prior to 58. Farmalls; Super M, Super MTA, 300, 400, 350, & 450. The following came out in late 58 and at the time were called 59 models. Farmalls; 240, 340, 460, and 560 were all available on factory LPG. I don't have any idea of the numbers of each that were produced.