Both the stuff which grows and the things to form objects such as trailer shells are "mould" in British usage and "mold" in American usage. It's interesting that a Canadian would use the British spelling for the form and the American spelling for the growing stuff. I normally use the British spelling whenever there is a difference.
What your spell checker likes depends on your dictionary choice (although some systems such as Google's Chrome don't offer a British dictionary for spell checking). Merriam-Webster
says "molded" is correct for something made in a mold; if it has mold (or mould) growing on it, it is "moldy" (or "mouldy"), not "molded" (or "moulded").
Back on the original topic... I agree, Alf's matched graphics look good!