In case anyone is in need of one, there is a guy on F/B selling the front bra from a GL1800, where he sold the bike with the chrome after market one on. He is looking for £75 but I suspect might take offers.
Give a shout out here if you need one.
There is also someone selling a load of GL1500 bits too. Some are on ebay and here is one example of what he is offering. You can of course look at the "other Items" that he is offering via the link.