How to tell if 360 tensioners and bolts are upgraded?

Experts, the topic has been discussed at length, but I still don't see a clear closure. Bulletin 1315 states that
below chassis number 136507 (assembly number 54662, engine number 83762) left tensioner with a bushing should be installed and updated bracket has a 10mm hole for that bushing.

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Bulletin 1236/A also states that this tensioner should be installed with updated bolts

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My assumption is that the original problem is that vibrations of the tensioner have caused original bolts to sheer in some cases. Ferrari used two solutions to address this single problem: a bushing around the upper bolt and stronger bolts. 1315 states that upgrade to the bracket is not necessary, and the bushing can be removed if a new tensioner is installed in old bracket, so it makes the new bolts a sufficient fix according to Ferrari. Questions:
1. Are the new tensioners fixing any other problems (have any other internal changes) except what is listed above?
2. New tensioner is easy to tell by the bushing, but how to tell if the new bolts have been installed? I have looked at 3 engines right now and the bolts are either not marked or marked with strength 10.9. Are the new bolts having a specific marking or visual difference from the old ones? Ferrari lists yellow or silver galvanizing but it does not mean much as most such bolts are galvanized. States material improvement from R80/100 to R120 but what does it mean? Those are stainless steel bolt gradings so Ferrari is contradicting itself stating this designation for galvanized (not stainless) bolts. Any clarification is appreciated.

As each of those bolts are over $80 and not everyone reads service bulletins, some unqualified people may skip using the upgraded bolts, so how to confirm that the upgraded bolts have been installed?

 

Hi

Thanks for the info and yes, I have read that thread very carefully before posting. Except for the manufacturer VT/VU marks mentioned it does not state how to recognize the new bolts. Also photos of the bolts on Ricambi website show VG and VS.

But what is that marking? I see either no marking at all or 10.9 class marking on all the 360 bolts I have seen.

So what do the professionals do when they do belt changes (in the absence of car history)? Do they simply ignore the issue and pretend it does not exist, or do they always buy and install new bolts?

BTW, Ferrari documentation incorrectly calls those bolts "screws" but it does not really matter.

 

And thank you for the suggestion about the bracket as well!

 

Thanks guys, I've also talked to a Ferrari mechanic meanwhile. According to him unfortunately there is no way to tell if the bolts have been upgraded or not. So I appreciate all the suggestions, but to be on a safe side I've just ordered the new bolts from Ricambi America for the car I'm working on now. Thank you! (Of course if anyone has any more info contradicting what has been said so far, please chime in)