We do not offer that type of bracket.
We do not sell the fasteners for these products.
X = 3.75" - Y = 2.75"
The hinge set you are referencing would not be appropriate for what you are describing.
The size of the bolt depends on what kind of structure you are mounting it to. The diameter of the fastener should be 3/8", but the length is dependent on material.
The pin is a M10 x 75 Metric and the thickness of the material is 1/4"
Yes, I used 7/16 carriage bolts to install.