I recently replaced my salt pools motor and bought a kit with a shaft seal, and another shaft seal for salt water. I notice your website references the same part number of PS-3867: https://www.amazon.com/gp/product/B004YLJ8V8/ref=oh_aui_detailpage_o01_s00?ie=UTF8&psc=1
That seal was too big and didn't seem to fit. Luckily I had also bought a rebuild kit: https://www.amazon.com/gp/product/B017RSN33S/ref=oh_aui_detailpage_o03_s00?ie=UTF8&psc=1
I'm not sure why the #200 from the kit worked, but the PS-3867 part doesn't, although they're both supposed to be #200 seals? I doubt it's rated for salt water, since it just says "Shaft Pump Seal Replacement 200." I have a PacFab pump that looks just like the diagram on your page: http://www.inyopools.com/pool_parts_pentair_pac_fab_challenger.aspx
Can you send me a product on the site that will fit and work for salt water?
Thanks