Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:4113145.

I just measured these out and put them all in one place for an easy grab.

I also notched the two inserts titled "Power Supply" to adjust for the screw heads holding the power supply on. Remove safely from bed as not to bend.

I aligned some to 45 degree angles for printing, although it is not necessary to print that way. They will all fit front to back on the Ender 3 bed, you just have to turn off your rafts (i.e. skirt).

Check the picture for their locations.

Enjoy!