Prop rod hook: Home depot electrical department, in the area selling electronic/audio cable and plugs and stuff - get a neoprene or rubber coated cable clamp - something with a 3/8"-1/2" ID should be fine. Position it in the car so half of it looks like what you have, then use a Dremel to neatly cut off what'cha don't want.
They may have a different device in the same area that you may prefer - just look around and see what's what. Radio Shack (if you local one has not yet become a cell-phone-only storefront) may have them, too.
Is that a Volvo brake fluid reservoir you're using on the MC??