thanks - I had just found that out on Facebook. I photo they sent shows it on the nacra 5.8 and it's attached with chain plates. Not sure I'd need that as it would allow it to bounce around more when trailering. But I see that in the photo it sticks up. Now I just need to figure out how to shorten the forestay. Here's the photo I was sent.
Any reason I should use the chain plates? The cross bar mounts line up with my bow (bridle) connectors perfectly. So if I omit the chain plates it lines up and pins down 1/2 inch over the hulls. On the nacra photo the plates appear to be required because the bar looks to narrow to reach the attach points on the hulls.