911 for 411 sb mechanical rockers

Received a set of rocker arms today .FedEx showed up on Sunday. Surprised me .but to the point..
Has anybody here ever seen a set of small block rocker arms as those pictured?. These were sold to me as a kit Made by Crane Cams. The seller whom I consider to be a quality provider of Quality Parts for Chrysler specific vehicles.
This is my first transaction with them. I called them to confirm the application , as well as the availability , because they didn't look like any small block rocker arm I'd ever seen before . And they had been posted on the website for some time as the last available . The part numbers posted at the website match The Crane Cams part numbers . In the last 6 months I've likely looked at thousands of small block rocker arms . I was assured on the telephone that they were small block rocker arms and that as long as I had not bolted them down I'd be able to return them. Gracious and informational and good on the telephone I have no complaints whatsoever other than what I see before me with these rocker arms. If these are small block rocker arms I may piss my self because these would be the best-looking LA arms I've ever seen. The arched rib across the top has got to be strong but I just don't believe they could possibly be that good a deal. Big block I say, how about you?
Thanks all .
I'll be on the telephone tomorrow morning . Hopefully a video call and I'll set these things up on a cylinder head I have mocked up here .
Matching them up side with an original rocker through there packaging has offered no definite that I can identify.

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