On the new stalk looking at the picture, from left to right
Brown with red stripe
Brown
Brown with white stripe
bottom row
Black with yellow
Spare
Black with white
I'll check the existing wires in the morning
OK, your exisiting Stalk has 3 connections for the MID display and you've now got one with 5 [1] which is for both the MID and the wiper bit.
Connect the Brown with red stripe , Brown, Brown with white stripe to your exisiting MID connector. You may find with a couple of picks you can remove the connectors from within the plastic socket and move them to the old socket. Otherwise it's a case of cutting them and solder them back up. The Black and Yellow and Black and White are for the variable wiper and connect up as my picture.
[1] ignoring the blank connectors