I built my car in 1982, long before all these Cobra companies and parts were around. So I looked at every real Cobra I could, to get an idea of what to do about things like wipers. Original Cobras used the same system as all the British sports cars of the era. So I found a TR3 in a boneyard and took all the wiper parts from it. It's a simple cable driven system - easy to install and looks original. The nice thing is, this stuff is still available new and with the internet, it's easy to find. Here's a catalog where you can order brand new stuff. Easy-peasy.
Triumph TR2, TR3, TR4, TR4A, TR250 & TR6 iCatalog - Victoria British, Ltd.
Rick