I had the same trouble with the gearbox and came across the apparent different size bearings. I thought it was odd so I asked the question to Schumacher:
"can you tell me, is the exploded drawing of the Cougar on your website correct with respect to the bearings on the transfer shaft that holds the spur?
On this drawing it shows two different sized bearings U1439 5x9x3 on the spur end and U1411 4x8x3 on the spring end."
Answer:
"You are correct, the diagram is wrong. All the bearings in the SV gearbox are 4x8x3mm, except the diff bearings. I would recommend the Rubber Sealed 4x8x3mm Bearings (U3075)"
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