Update: Finally had time to take some measurements and send the corrections to my modeler. I suspect that changing the overall dimensions will screw with the hole alignment or the side profile of the part. If that is the case I'll need to print two, otherwise this will be my last print before they go to market.
Also, mailing a relay base today. I'll spend my online time researching materials. The polyjet printer that my buddy operates is a good option because the melting point is very high on the material that they use. Also, the parts are small and inexpensive to print, which was the big detractor for using his printer in the past.
Lastly, the parking brake handle will be ready for a test print soon. The only tricky part with this one is getting the slip-fit taper correct. There may be some iterations. Kudos to
Mark99 for modeling. I traded some OEM carpet for a parking brake model. This part should feel hard and smooth, but be flexible enough to stretch over the parking brake handle. I'm thinking that Nylon will be the material of choice, same as the AC Face Plate.