Hoop bow stop

     Hello ,
First time to post a question on site, I purchased a 1979 southwind about a year ago and traveled 1,300 miles round trip which is another story that I may post haha. The boat is on a 3dv trailer that has an ill conceived bow stop and winch welded in place of the original hoop or channel and 2x6 was . I would like to. Replicate the hoop and crash pad stop. My question is there a difference in the hoop on a 3 trailer to a 3dv. The other question where can I find drawings , specs on this bow stop. Thank you
This site has been so informative and has helped me avoid pitfalls in repairing and bringing my boat up to speed . Hats off to all