WH has both poly and rubber.
Duff prolly does too.
I went to a Heavy Equipment place once. They serviced semi's and such.
I was sent there by an old man at a NAPA that didn't have TC mounts available without ordering back in the 80's.
The semi part house had them. Still being used in the 80's for something on semi's. Prolly a tranny mount.
Anyway...I just replaced them a year or so ago. They were pretty beat.
Replaced them with poly.
I just looked and didn't see them at JBG, WH, or Duff's.
NPD, LMC, and Dennis Carpenter may have them. They are more OEM.