Lotus Exige seatbelt blank.

You upgrade your Lotus exige 2010 seatbelt harness (as you do because that's what everyone does). Race it on a track. You get a 'ping ping' to tell you to clip your belt in. Arrrrg!!!!, ping must go. This fixes it, and allows you to go shopping too.

If you really have decided to carry groceries with you and need to not have them slip about, this nails it.

In under 4cc of ABS plastic for peace of mind, and no ping pings, help yourself. I've also made an openscad file if you're interested.