I replaced my entire crossbeam, dolphin striker, and attachment brackets on my 410 catamaran last summer at Zahnisers in Solomon¡¯s Island in the Chesapeake. I left the old crossbeam there with the end pieces which are welded to the beam. US Spars fabricated the new crossbeam from the specifications they had on file. My new crossbeam is different in cross section so the end brackets are totally different. If you want more details send me an email.
From Byrne on Lagoon 410 Spray
Byrne Falke