Doland,
In the "for what it's worth" department: I have only seen four (4) 3Renshos and never saw a Suntour part on any of them as they were Campy & Shimano equipped. The one I have (although I've stripped it) came with a Campy/Shimano (Dura Ace) mix and Modolo brakes!
The Suntour idea would be fine of course (hmmmmm??).
I don't know of any for sale!
Take care......
Chuck Brooks
Malta (5" of wet, slushy snow!!!) NY