O-rings on Yoke Question

[Roman s]

Brand new SEI 106. On the yoke there are three machined slots for the o-rings. There are two on the yoke that are nearest the drive or ujoints. These two slots each take one o-ring. Correct? There is also a slot at the front near the coupler splines. I do have a grease fitting on the coupler. This is a new engine. Is there a rubber o-ring that fits on the slot nearest the spline on the yoke? If so, what size is it?
Thanks Roman

[Bt Doctur]

O ring

That one usually comes in the kit.Not needed .The proper way to grease the spline is to REMOVE the drive for inspection.The old grease fitting in the hub is useless.Yes, you can put grease in there but does it completely circle the shaft splines??. what about lubing the "U" joints??, checking engine alignment??, oil leakage from the carrier seal??
Service it correctly and it will last a long time. There is no shortcut here .