Air diverter control valve for 1990 Cadillac

My 1990 Cadillace Fleetwood 4.5 liter, V-8 failed emissions because of a defective air diverter control valve. This part has been obsoleted by both the original manufacturer and the after market manufacter. Therefore I cannot get it fixed and I cannot pass emissions without the repair. I suppose I could go to a junkyard for the part, but don’t especially want to. What to do?? I have reregistered my vehicles in another county where I have a vacation home, but still would rather fix it.

Rock auto appears to have them. I didn’t go so far as to check out :wink: but you can try it here-

Just troll down through the manf/model/year/emission/diverter valve and viola!