Christopher - Grip choices for this little gun are very limited. The Windicator was originally made and sold under the name Arminius Revolver. From what I can see the grips that fit he Arminius will also fit the Windicator. That still doesn't solve your situation, but it does give you another "search word" to use in running down some grips. The Windicator is on a frame design of its own - it doesn't share with S&W, although in size it is similar to a K frame.

Christopher, this is basically a K-Frame size Revolver (I own a 2" version and have not been able to find suitable replacement grips). EAA is out of stock on their Windicator Grips : http://eaacorp.com/gun_accessories/index.php/parts/weihrauch/windicator/windicator-accessories.html