A new theory

I really can't see that Triumph would rely on a bearing seal to retain oil pressure, and if it was the case I think a lot of engines would have had issues once the frond bearing cage disintegrated.
plenty riders replaced that thing me included in 2011 with help from " rocket scientist "with the factory kit with no ill effect thereafter
 

I looked at each year starting with 2005 and found this listing starts with year 2011 and continues up to 2018.....note the engine # info:
6:
CHAIN, CAM DRIVE, 170 LINKS T1143200
Eng No 362330 >

1 Ships within 1 to 2 business weeks $114.71 $114.71

BUT ALSO NOTE THIS! There is still another part number listed for the cam chain, item # 6 in diagram.....same one originally listed for your bike and mine:
6:
SPRS KIT,CAMCHAIN & SPROCKETS T1141127

1 Ships within 1 to 2 business weeks $80.18 $80.18
 
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Your asking the wrong guy. That is what Hermy's told me. Am not a engineer. Just a dumb ass welder.