Carl,
this will make a great combo, you will be very happy.
ADM in the US, (Google it) make excellent accessories, but you will also be able to buy locally the products you need, I know Bintel in Sydney has the stuff you require.
"D Style" is the name given to Losmandy rails and saddles, it is the size effectively of the rail. Since you don't have anything at the moment, kick straight into getting and settling on that size.
You will need a dovetail rail, about 13" long, (ADM make them 7, 11, and 13, plus longer 15" I think). The Stellarvue clamshell will screw straight to the rail, and the rail will then fit and be accepted by the D style saddle your NEQ6 has. Simple.
Later, if the 115mm newt is to be attached, get another rail (buy the two at once is what I am saying), and then a set of tube rings if it doesn't already have them. If it does great, if not then they are also available locally. The tube rings will screw to the rail, and the rail then fits the saddle, simple enough?
Gary
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