Per the book, the disk is 13" diameter, standard is 1 1/4 diameter with a 6 1/2 offset.
Per measurements of a sample:
Standard offset 6".
Upper section from center line of horizontal section to tip 5.
Lower section from center line of horizontal section to center line of bearing 8.
Over all height from top of standard to bottom of disk 19.
Note that the disk is at a bit of an angle, top of disk to center line of upper section of standard 4, bottom of disk to center line of upper section of standard 2 1/2.
Top of standard to center line of bearing 12.
If you are trying to duplicate the relationship between the upper part of the standard and the disk, the 6" offset may not work because of differences in the bearing of the AgriSupply hillers.