they are main dealer only as apart from engine re-builders they dont tend to get touched, i use a old guy for engine machine work in the uk he.s well in his seventy's been rebuilding engines all his life, so in the past i have asked him for these bolts and his answer after rebuilding hundreds of them and never having one back from reusing these bolts. i have done a lot of them as well like this and just give a coat of blue thread lock on them and reuse them,. i know its not the prescribed way forward and would never do this on stretch bolts with cylinder heads but on the mains it will be fine, save your self a few quid as because there is a cartridge for crankshaft to block its very strong,, when re torquing them you get a feel to what the bolt is about to do but those bolts are near impossible to snap off i use a 3ft breaker bar when doing them
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