Yup, same thing happened to me a couple of months ago on my 2009 B31, and I know it also happened on a nearby 2008 B34.
Those black plastic parts are a real design flaw, and like you it broke on a shift into reverse while docking. They are a bit of a bugger to replace (tight space and I had to access via the binnacle as well as the helm) but I too got that kit you ordered and managed to fix it.
Good luck, and keep some spares!
Riyad
S/V Battuta
Vancouver, Canada