I have a 1995 Hydrodyne Grand Sport and all the stitching has dry rotted so I don't know if I can get Hydrodyne skins still or will I have to go custom has anyone replaced the interior in one of these if so where did you get the skins

The last I heard Hydrodyne was owned by Bob Jessup of Calabria. These boats were basically rebadged Calabrias, so their interiors would not work for your boat. You might give Calabria a call & see if they can tell you if anyone still has the old patterns & can make the skins for you. Otherwise it's probably a custom job.

Hydrodyne was it's own company and has been gone since the mid 90's, just have a local upholstery shop build you some new skins it's your only hope. Don't know if it's true but i recently heard calabria is done too

Is the vinyl bad or is the thread just deteriorated? You might be able to get the covers you have stitched back up. I did that on some seats in an old Malibu.