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so holley still sells them
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They do but not the original style that was a 4" tube all the way to the turn-out with mount straps welded to them.
The ones Motion pictured above are built more along the Junior version (though not exact) that Cyclone built because the original Hornie was, well, pretty damned throaty

. The Junior version calmed the roar (one of those ticketable vehicle code things, ya know?) which was why you bought the Purple Hornies in the first place.
Once you broke the originals in, and yes, they were loud (loud being a relative term. I prefer to say they had a very distinct and authoritative pitch

), they were the best sounding header muffs built.