Yes those seals you show from Summit are typical unbrella seals. Used by many manufacturers as OE, but not much by GM. Ford used them allot. They fit on the valve stems and ride along on them deflecting oil much like the O-ring and sheet metal shield set-up Chevrolet and many Pontiac engines use OE. They are OK, I guess. A positive seal that fits tightly on the guide is better but requires machining. If the heads are on the car, umbrellas are fine. If the heads are off, machining for positive seals is fairly inexpensive and they do work better.
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