Fitted mine this afternoon and I had already obtained a spare shroud from the original fan, part # 60035044050 that adapts on surprisingly well.
After cutting off the original mounting lugs I fitted it to the fan with long cable ties attached end to end. Note slight modification to existing hole to catch on edge of fan bracket.
Here you can see how the cable ties get a grip on the slight lip on the fan, I have also trimmed a little off the tip of the shroud to keep inside tank line.
You only need two tools in life: WD-40 and Duct Tape.
If it doesn't move and should use the WD-40, if it moves and shouldn't, use the Duct Tape.