br700

This is driving me crazy. I bought a used BR700 and it only has the upper parts of the tube up to and including the handle/trigger. Nothing beyond that. I have found online diagrams galore but they don't show me what part numbers I need or I am too stupid to figure it out. It's not the coupler...

Anybody have a working Stihl BR 550 Craftshaft part no: 4282 030 0404 ?? My bearings are shot. Actually, only need the bearings but the whole unit is one part. I believe the crankshaft for my unit is same part as BR500, BR550, BR600, & BR700. Willing to buy or trade chainsaw parts for your...