Well, I 've still got the BA4 from that 79 bus I got last Spring. It's the one that mounts in the left of the engine compartment. I ran it for 15 minutes and it worked great. I pulled all the ducts, wires, cables, timer, etc. so it's complete except for one little knob for the cable that goes under the seat, which would use any knob. Just let me know if you want it before I get around to eBaying it.