For reference, here’s a list of all the bearings, seals, o-rings, bushes, gaskets, springs washers ie. everything you need to rebuild a Series Gearbox apart from the actual gears. A couple of years ago I priced it all up to just over £300 inc vat for all genuine parts – they’ll probably cost a bit more now.
1645 Rear Main shaft Bearing (x1)
2422 Split pin for 4WD clevis fork (x2)
PS608101 Split Pin for Output castle nut (x2)
5852 Selector ball spring rubber sealing ring (x2)
RTC1956 3/4 Syncro Detent Spring (x3)
6397 Needle Roller Bearing (x1)
6405 Peg Main shaft Spacer (x1)
55714 Bearing Primary Pinion (x1)
211502 Speedo Drive Oil Seal (x1)
217325 Output Shaft Bearing (x1)
217476 Main shaft lock washer (x1)
217478 Rear main shaft bearing (x1)
217490 Front of transfer output shaft bearing (x1)
231116 Reverse stop gate spring (x2)
236305 Main shaft oil seal (x1)
FRC1780 Output shaft oil seal (x2)
243714 Clip for transfer lever
267828 O-ring for speedometer pinion and inter shaft (x2)
272596 O-ring for forward selector shafts (x2)
272597 O-ring for reverse gear selector shaft (x1)
528683 Front layshaft bearing retainer lock tab (x1)
528701 Front layshaft bearing (x1)
532323 O-ring for intermediate shaft (x1)
571059 Clutch sleeve housing oil seal (x1)
599869 Transfer box intermediate gear needle roller bearing (x2)
600603 Full gasket set (x1)
622042 Output shaft felt seal
90217512 Output shaft rear bearing (x1) genuine part no longer available
FRC4076 Main shaft 2nd Speed gear bush (x1)
FRC4077 Main shaft 3rd speed gear bronze bush (x1)
RTC1412 Rear layshaft bearing (x1)
RTC1979 Peg for 2nd gear thrust washer (x1)
I’m pretty certain that’s a definitive list but feel free to let me know if I’ve missed anything.