I bought some replacement switches and rubber switch "boots" for my 1988 33 open from Tiara service last year.
Otherwise try this place - FPmarine.com
They have tons of switches and accessories
Good Luck
You can purchase new switches or new covers as the old ones just pop off from [Only registered and activated users can see links Click here to register] . I have enclosed the link for them here but verify the switches are made by Carling Switch and they are the style of Contura. I have a 2000 3500 and I replace all my rubber switch cover with hard plastic and even color coordinated some of them for quick access. All my wiper switches are white, real easy and quick to find. And they only cost $0.97 from digikey, can't beat that price. Well maybe you can no really sure.
If you are asking about the ignition switch weather proof boots, the ones with a key slit in them, try e-Bay under "ignition switch boot" or Google it and then click on "images" and pick the one you want. Capt. George