I have an OMNI 150 XLT reflector telescope.
One photo shows the top of the scope.(7 1/4" between screws)
The other photo shows what I am planning to purchase so as to attach accessories.
1) Is this the right type of item to buy (Vixen Style Universal Dovetail)?
2) If so, is the bigger size better (14" instead of 11") for an extra $5.00
Or, am I on the wrong track here? If so, please give some other recommendations.