T 56 swap question

Your diagram is of an early GM T56. Your T56 has a one piece countershaft. Also here is a pic of a Challenger RST clutch on the left and a "normal" RST on the right.
http://www.speedysgarage.net/challe...de/images/challenger_mcleod_update_02_web.jpg

I thought as much, even the OEM official mopar exploded parts view of the dodge ram series shows a 2 piece countershaft so they are not correct. Therefore I'm not sure as to what washers I have to put on the reverse idler gear shaft? Anyone have any hands on experience and knows what washers go on the shaft?