I remember a guy in this forum (I think his name was Jim?) looking for netted halo headrests for his 91 GT. I stumbled across these if your still looking:
http://cgi.ebay.com/ebaymotors/86-9...42612QQitemZ8019866384QQrdZ1QQsspagenameZWDVW
http://cgi.ebay.com/ebaymotors/86-9...42612QQitemZ8019866384QQrdZ1QQsspagenameZWDVW