Picked up the $99.99 seat from Orscheln today for my 154 Cub Low-Boy. The mounting rails on the seat are sideways adjustable and the prepunched holes in the rails match the original 154 Low-Boy seat mounting rails. It's a simple direct exchange.
When you tip the seat forward it cocks a bit to the left on the original 154 mounting rails. Simple fix appears to be to add a metal strap to the back of the original mounting rails - providing a bit of cross bracing.
The seat cushion is about 3 inches thick. Feels like you are sitting taller than normal. Quality appears to be satisfactory. But then I not made extensive use of the seat.