A&E Dometic lower arm

[cutndried]

I need a replacement lower arm for my Dometic awning on my 79 argosy minuet 7.3. The trouble I’m having is that apparently, the model information was stamped on the part I’m missing. I am providing a photo of what I need, maybe someone has a similar awning and can tell me the model #, or where I can order a part. The part I need is the small part on the right with the slight bend at the base where it mounts to the trailer.

Thanks,
Bill