https://www.bintelshop.com.au/welcome.htm
I had some Bintels 8" rings they are really for piggy back on a Mead SCT. But
a temporary measure fixed mine to the EQ6 dovetail work finet (A$129)
http://www.myastroshop.com.au/products/tuberings.asp
102mm sounds about right and bargain at A$ 37.18 - if they fit, havent tried yet.