Favorite Big Block Roller Rockers

Are these currently available?
Rocker Arms Unlimited won't open on my computer. I get a message saying the site is blocked. I have only seen these in a book several years ago and I thought they were no longer available when that book was published, although they looked a little different than yours.
About Rocker Arms Unlimited
http://www.rockerarms.com/pdf/pl440flyer.pdf
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