The component you need to repair is whats known as the "shifter stub", as referenced to this link
M5R1 Shifter Stub Repair Kit
Do not purchase this kit as this will not work with your newer HD trans. I have the components on the top, the two plastic pieces that the ball sits inside as well as the spring washer. What you seek looks like this
You may also just need a spacer for the bottom shifter seat, this would bring up the seat and reduce/eliminate any slop you might have in your setup. I'm willing to bet that this is what you need to do, unless you have purchased the wrong kit for a different year trans and it is just not the right size.
M5R1/R2 Shifter Spacer
Regardless, if you want the pieces I have, you are welcome to them. Leftovers from when I rebuilt my transmission.
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2001.5 2.3 213xxx and counting
M501-HD L154 Manual
Don't bother looking for 1st gear synchros, I bought the last one