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Your correct, your flat chain brackets are an older version but still very functional (same as mine, 10 years old)...... they came in a gold and silver finish (mine are gold). Most important about the Reese Dual Cam (Strait- Line) chain brackets is to insure they are attached to the cam arm properly....., your "flat" chain brackets are attached correctly (U-bolt threads facing "outward").
If your flat chain brackets were mounted with U-bolt threads facing 'inward' the chain would have a tendency to pull the snap-up bracket outward (away) from the TT's A-frame. With the U-bolt threads facing outward the chain should hang straight down from the "engaged" snap-up bracket.
Your also correct that the newer Reese Dual Cam (Strait Line) versions the chain bracket has a slight bend at the top...., in this case the U-bolt threads should be facing "inward".
Here's an older JOF thread that shows the two different style chain brackets and proper attachment:
If you have any specific product questions (cam hanger brackets, etc.), call Reese (Cequent) directly...., their tech support has been pretty good in the past:
1-800-632-3290 or 1-888-521-0510