.

 

If those drums are for a Cutlass, try NAPA. I found a set for my '71 and they were the same style as the originals. I'm not sure if they called those 'vented', but there is a gap between the inner drum and outer finned surface.

 

The only option is to find good used ones.

None of the aftermarket drums are bell shaped.

 

Where are you located? I'm in south Florida. I should have some "flared" rear drums in my collection. I have a drum mic to be sure that they're serviceable. Thanks, Bob.

 

I refer to them as the "lamp shade" style because they look like a lamp shade. These are not cast drums.They are formed steel.They have ribs that run around the drum,NOT front to back,like the "cooling fins".

 

I'll check and let you know. Thanks, Bob