Center bolt valve covers Anybody have pictures of inside of tall style?

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http://www.speedwaymotors.com/Blumax-Chevy-Aluminum-Roller-Rocker-Arms,6566.html

BLUMAX S/B CHEVY ALUMINUM ROLLER ROCKER ARMS Item # 57533519

The BluMax self aligning, narrow-body aluminum roller are designed to the same high standards as the other other BluMax rockers, but are for use with center bolt valve cover heads.
Features:

• Self-aligning, no need for push rod plates
• Designed to give better clearance with center bolt valve covers
• Ideal for Vortec and other center-bolt heads

Cannot be used on heads that have not had the stock "slotted" push rod hole drilled out to a round hole. Cannot be used with guide plates.

Martin