[OYMC]

Now to set up the rear mark.

From the trailing edge of the rear bed mount bolt hole on chassis I measured 71 5/8" forward on chassis, and made a temp mark. Because I decided to use the stock bed mount bolt hole on the chassis, I measured 1 1/2" back from my temp 71 5/8" mark.

Remember to make a reference mark on the rear bed mount bolt hole on chassis to keep all measurements square to each other.