I used the AE T5 battery hold down and post with the HPI thumb screws.
AE parts:
31256- graphit battery hold down
31254- hold down post
HPI parts:
86969- thumb screws
You have to drill holes for the post screws and counter sink them. There i an ear on the bottom of the post that sits in the slot that the strapping tape goes through. I had to remove about 1/4 inch from the outside of this so it wouldn't hit the top plate. You will also need a 3mmx16mm set screw to use as mounts. I got these at the local hardware store.