Earlier today I received a tip from MKE Elevators that Beaver Dam's last SD-10 was replaced. Initially I had thought they bought another 2001-130 - I was quite surprised to see a 508 standing next to the SD-10. It has not been wired up yet and even retains a cardboard sleeve where the electric meter will go. There also appeared to be a spider inside the horn.
I will probably try recording the 508 once it's hooked up and ready to go. I've never seen one in person until today. They're rather big compared to the 2001-130, if only because of the huge gaping horn. It really does look like a modernized 500A although it might reminds one of a large eyeball instead.
It's a shame to see the SD-10 go but it was on its last limbs. The lower pitched 508 will be more adept at handling the hills it's located in.