I purchased a "bargain" Baldor 500 Carbide grinder on eBay. It looked great in pics, but it went cheap as there was something in description about it not working correctly. I took a gamble and found out that the motor was toast - the windings in the field coils were shorted (it looked like a manufacturing error as this couldn't have seen much use. Also one of the end castings was broken.
Not to be deterred - I found a place in L.A. that would rewind the motor for $300 and I was able to weld the casting back together. So I ended up with a pretty nice unit.
BUT - I still wanted a miter gauge. I started to look for one, but they run $145+ used on eBay! No way! Here's a pic of the PB-547. It's about 1" tall by 3" wide.
So what's a person to do? Make your own of course. I made it out of some scrap I had around. The fence part was done on my CNC and I used Fusion 360 for the CAD/CAM. Took about a day to get it done. Here's my version, I think it turned out OK and I know I'll use it.
Here's a bit of detail