Just bought a 1989 Parker Southwester w/a. Looking for replacement parts like cushions, screens, hardware, Bimini top,etc. any suggestions nowhere we can buy these items. Thank you for your help. Chris
Many of the items that you are asking about were sourced by the factory from various vendors over the years.
Some can be found locally at any good marine hardware dealer, and some can be found at your local Parker dealer.
If you have specific items you are looking for, make a post to the 'Projects' section, and remember that photos always help.