Re: M_Boats: M-15 tunrbuckle?

I want to replace the clip-on device that secures the foreshroud of my 1985 M-15 to the bow of the boat with a turnbuckle, which would be easier to adjust. I found Johnson turnbuckes at West Marine and other local boat hardware shops that are available in 3/16 or 1/4 and bigger sizes, but the 3/16 looks too small, and the 1/4 looks too big. Any suggestions of where I could find a stainless steel turnbucke in the Puget Sound area that is not too small and not too big ? Steve M-15 # 335