Re: 1977 invader trihull...what windshield and wher??
Search on Craigslist and eBay. I bought mine on eBay and it worked out great on my boat even though it wasn't at all like the original it replaced. http://crazedlist.org/ will let you search a number of CL sites at the same time.
Re: 1977 invader trihull...what windshield and wher??
Aluminum angle iron and plexy is the most economical way to go. Also look on craigslist and ebay for used windshields. Or order a new one from here, they have flat and curved windshields.