I have a broken clip on Alps Outdoors pack frame. It looks to be a project to thread new clips on but have found "replacement" clips online but not for the 1 1/2 inch straps that I have. Are there other options to repair this?
On the 1 pin/2 pin thing, those are incredibly universal, not specific to anything. The 1 pin means only one end of the buckle has a removable pin, 2 pin means both sides of the buckle do. They have pins that are actually little screws that you remove to that they can be attached to loops that are already sewn shut.
1 pin:
2 pin:
pin removed:
They are super nifty for attaching things without having to re-sew loops.
An addendum though, the sides with the pins can't be used to tighten on a strap as there is no friction to hold them. Generally pack waist belt buckles are very easy to remove and replace with standard buckles that can be used to tighten straps. If that is waist belt strap, you definitely want the last style posted by @wllm1313 .