No, no extras anymore. They are all employed in my "rattletraps!"
The '86's use these, too.
You can use two or so very long, traditional hose clamps all the way around the air box. Just don't tighten so hard that you crack the plastic cover.
Brian from Purcell, Oklahoma (on "the Samba" web site under "watercooled-classifieds) could probably hook you up with some for a price. He deals in a lot of VW diesel stuff and I have found the guy to be very quick, honest and simply a nice guy.
I really prefer the later N/A (more vertically oriented) air boxes much more. They only have 4 smaller clips and keep the lid much tighter. I think these were in the '88 to '92's. But, you need the bottom and top of the box to make it happen.