I'll see if I can guide you to Don's old posts. I know there is away just haven't done it in a while. BRB.
OK , I found the list of Dutch Star Don's ( formerly Diplomat Don ) posts, 51 pages of them . If one of the moderators can't link you to the post your looking for you may have to send him a personal message to have him link you to it.
If you see a post by Dutch Star Don , click on his name and a drop box will allow you to choose to send him a message. There is a short cut , and I'll try and find it .
EDIT: I'm getting very stupid in my old age. In the blue bar under your sign in and welcome message , click the " Search " for a drop box , Type in " Diplomat radiator " and post will appear, if not the one your after then Dutch Star Don 's name will come up and you can send him a message.