Attached is a quote for the conversion kit.
I am on the phone with Volvo Penta (another department) and they found a bulletin dealing with oil contamination. In the bulletin it describes what you have to do to remedy the contamination and adds this 21551779 kit as well. My guess is that Volvo Penta thinks you should do the upgrade while working on the contamination issue.
They are going to send me this bulletin and I will forward it to you. And hopefully Volvo Penta technical will find the bulletin (if one exists) describing the upgrade by itself.