I had various bits and pieces of mirror sets that I'd had over the years, and a pair of Oras I got for $8.00 from a garage sale, which wouldn't fit the original Troopy Mirrors. And I picked up a brand new set of Britax Tradey mirrors for $80, from a bloke who just fitted Clearviews to his new 79 Series.
The tradey mirrors were a fair bit too wide, so I modified them, to make them a lot smaller, but they are still about 30mm too wide really, but I'll risk it. I also made some backing plates for the bottom mirror mount, that I sickaflexed inplace.
I then cut up the attachments for the Oras, that clip onto the original mirror, and just used the arm holding brackets, to attach to the Tradey mirror brackets using some 4mm aluminium angle.
The pictures will explain the rest.