Probably seen before..

Ventruck

Fan of the EE videos. He's pretty concise when you need a quick review of some concepts. Literally seems like that guy you wish could help you on an engineering midterm/final (if that was your major). On the car side he's not necessarily an expert of sorts, but still puts out thorough opinions of his own.

Thought about them but they're like over $100 per piece. Also needs additional drilling for the center push bolt to secure itself.

There are shorter ones, but I have no idea what they look like mounted.