I'm in eastern Washington. My 1710 also has the 770B loader. A recent clutch problem brought in parts from Maine and Tennessee to Oregon.
Farmland Tractor Supply in Tangent, OR has salvage 1710s. 877-928-1646.
They were very helpful.
If you need specific pictures or measurements I may be able to help.
I am looking for measurements, etc. of the parking stands for the 770B loader if you have those.