Quality aftermarket parts supplier???

[crazy charlie]

i have a 2000 200hp saltwater series .Only using oem parts when I service .The supplier SIM has recently had some supply issues and after waiting 1 month for some pretty basic parts I cancelled the order.For my mercruiser I have used Quicksilver,Sierra etc when Mercruiser parts were not available or cost prohibitive as they are quality parts.Anyone know of any quality afternarket parts for a Yamaha? Waterpump kits etc.Thanks Charlie btw I saw SEI marine products with parts available .I assume they are the company that makes the composite aftermarket outdrives.Quality?