On my '98 Sig they are Cole Hersee battery switches. Call your local NAPA or anyplace that deals with big rigs as they use them as well or Amazon. There are better ones out there as far as current carrying capacity goes : flaming river, better Cole Hersee, and others.
1998 Signature 42' M11 450hp - -pulling 25" enclosed trailer with SCU sandcar inside
Lovely Wife, 2 kids, 3 dogs, 2 cats
Diesel Mechanic to the stars