Originally Posted by yellow15
-IRS160 Associated Style Pod Plates (pr.) - Blue - lowered 0.090 than stock pod plates
These are the ones that fit the standard 12L3/L4 hole pattern in the top and bottom pod plate, as well as CRC, Speedmerchant, etc.
-URS1161 1/12th Pod Upgrade - For Associated 12L4 - Blue pod plates
This is an entirely new pod that uses 4 bolts to hold it to the upper pod plate. Requires new upper and lower pod plates to work. Supposed to be stiffer and more precise than the other style.
-IRS163 Extended Pod Plates for Associated Style Pan Cars
These have the bearing holders moved back 1/8" or so to extend the wheelbase and allow more room for bigger gears. These are generally for oval and not used on roadcourse cars.