The diagonal is the Vixen model Ga-4. It is an illuminated guiding instrument. It allows you to use any 1.25" eyepiece. You can then position the illuminated reticle any where in the field of view and position the cross hairs to align with the direction of travel - thus telling exactly how much corection is needed. It also comes with the vixen supplied barlow. It is in Exc- condition. It has two very small dings and the usual set screw marks. The optics are perfect. New cost was $200, will sell for $160 shipped.
The rings are the vixen rings sold by orion. They are intended for a 60mm scope but I have used them on a 70mm scope just fine. They are in new condition. New cost was $50, will sell for $35 shipped.
Will sell together for $185 shipped.