Maybe start a list on what hood is on your 70 or 71 Ebody and the build date for the car and crush zones or not.

1971 Challenger Convert. November 1970 door sticker A-20 on BC sheet, flat hood with crush zones.
1971 Challenger June 1971 door sticker May 24,71 on the fender tag, Shaker Hood with Crush Zones.
1971 Cuda Nov. 5th 1970 build date on the fender tag Shaker Hood with Crush zones.
1971 Cuda Nov. 5th 1970 build date on the fender tag Rallye Hood with Crush Zones.

Also have a Shaker hood off a May 1971 built car and it has crush zones and a Rallye hood that is a 1970 Model with NO crush zones and that I believe came off a Sept.1969 built Challenger.

1971 HEMI E BODY REGISTRY