As part of our ongoing trailer saga, we are replacing all our frame hooks and tie downs. Snapping Turtle (1800-TIE-DOWN) was recently purchased by a trailer company. In my opinion, the customer service has seriously suffered. No more discounts for VCA members and I think the prices are high. They were out of the frame hooks and could not get them in time for our trip this weekend. I ordered $500 worth of stuff from them to replace what was stolen and I am praying it shows up in time for us to leave tomorrow. After getting a bit ticked off, I thought there must be another solution. I found the correct Frame hooks here:
AWDirect
These folks supply the towing industry and appear to have just about anything. I'll bet they would make up what you are looking for. Otherwise, a search on M&R Products may help - they are a major supplier of tie downs.
Anyway, if your need for frame hooks is immediate - call them...
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Happy hunting.