I bought these two items about a month ago thinking that I'd venture into astrophotography. However, I decided not too and sold the OM-1 and accessories. The weight set & Piggyback are for a Meade 8" SCT. However, they may fit other brands too. The set inclues the rail w/screws, a 1#, 2# and a 3# weight. The piggyback is the standard model that fits on the rear cell. As you can see, I haven't even unwrapped all of the weights from when I received it.
Asking $90 for All which includes Standard shipping...Priority Mail will be more....(Consider 6lbs. of weights).
Thanks for looking.