According to the Trail Manor parts catalog, it is part number 21028, Upper Hold Down. In your photo, you can see that it is attached with a strap through the middle of it, with bolts through the strap and upward into the shell. In earlier days, the strap was quite short, and had 2 bolts through it. In later days, the strap was lengthened and attached with 4 bolts. If you have only 2 bolts, you need to add two more.
Bill
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