Okay, the finer details as promised.
The following will be the bearing number filled by where it's used.
For the 4 idler pulleys, I split them by drilling out the spot welds/rivets and replaced the bearings rather than spending $200 on a full set of idlers.
6206 - GT393 - 1 in the centre thrust bearing.
6204 - GT395 - 1 each for the 2 clutch discs, 2 in the cutter spindle.
6203 - GT396 - 1 in the drive belt adjustment/idler pulley
6202 - (to suit GT1008 & GT1009) - 1 each (4 total) in the two flat drive belts idlers and two V cutter idler pulleys.
GT392 - lay shaft bearings) is a 303 bearing with AS202-1010D1 on the box
The only bearings yet to remove and replace are the rear axle and front wheel bearings which I'll do next month when time is on my side again.
Flat Drive idlers 2-5/8" diameter of the running surface
V Cutter idlers 4-1/4" OD
The cutting deck pulley was a generic 8" B section pulley from CBC. It came with a 1/2" bore and a large boss on one side. I've bored, tapped and machined off party of the boss to suit. Prior to fitment I'll probably break/round of the edges as the pulley groove is quite sharp and won't suit the twist of the belt.
I'll post the part number once the invoice shows itself again, haha.
If anyone comes across cutting deck pulley dramas and heads in the same direction as I have, I'll be happy to lend out my 3/4 LH UNF tap set to suit (to a reputable ODK member) with a refundable deposit.
