Hydro bell housing from a late-model SM465. I pulled this from a 1986 K10 and wound up not using it (decided on an NV3500 swap instead of the NV4500 swap I had planned). Casting number should be #15530202, and I can check the casting to verify (if it's important to you). Comes with the old arm, boot, and throwout bearing (if you want the old hardware). $275 shipped to the lower 48.