I just saw this reply -- sorry for the late response! I'm not sure how I missed it, and since this was from a while ago, it may be old news, but here goes.
I ordered the part from Smith Volvo, in San Luis Obispo CA. Tim has been the parts manager there for many years and has always been helpful.
https://parts.smithvolvo.com/p/Volvo...9/1257565.html
Not much to it for $28 but such is life. It fit well and greatly reduced the oil grunge that was collecting on the top of the valve cover.
I hope this will be helpful for somebody.