About x14271, I saw a retrofit document that show if you want to install the alarm system, you need to use the same pin # on the x14271 connector. They said that if the pin # is already used, you have to connect your cable with a miniature connector. (It looks like this crimp I think).
Anyway, if it's the case, I had bad experience with this product so I would weld it instead.
Do you know which fuse # are connected to the lumbar and side bolster and the connector x#?
I have ordered a black dye kit from this site: www.dynamixdyes.com
. Look at the pictures if you are interested.