That's the same style that came with my '66 model F. Unsure if they are correct for that year...but they work well.
Dan,
I've not seen them on a 66 before, on the "G" I had were the same as in the ones shown by Mark, although I have seen that more curvasious shape (like mine) on an "H" model of a friend of mine, which he has had since basically new....yeah I know, he's owned it a while.
My "K" model, which is an Aerobat Serial No. 185, has the same ones fitted, and as far as I can tell, they are the originals from when the aircraft arrived here in Oz in 1970.
Cheers