I think Reumster is right. There are only one size trailing arms. You could buy new from LMC or maybe others. If you have the capability to sandblast and rebuild your old ones that may be the way to go. That is what I did. It took a little time and some 1/8 plate steel and some welding. My brother who has been an engineer with a major car manufacturer for over 30 years (I don't suppose I dare say Ford - just did) thought it looked all right.
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Hobby 67 Stepside