Centering bolts specification for 68 911s Sporto start motor

[1968sporto911s]

Next week I am going to pick up my Sporto gearbox and then the time has come to build it together with the engine and mount it in my 68 911s Sporto.
However, there is a problem and that is I don't have bolts to attach the starter motor and those are two centering bolts.
These are no longer available from Porsche.
PET tells me they are the following bolts.
900 155 018 02 M10x110
900 155 019 02 M10x70
The last one is identified as a bolt specifically for the Sportomatic.
However, what I want to know what are the lengths and thicknesses of the centering part of the bolts?
Who can tell me?
Thanks.

[911quest]

I see you have an Alfa the 911 doesn’t use centering bolts to adjust the starter The lower stud should be in the bell housing of the sportomatic. The starter it’s self is self centering.

[gled49]

I suspect it’s a translation error, trust the German not the English translation. Use bolt dimensions and disregard the centering interpretation.

[1968sporto911s]

I see you have an Alfa the 911 doesn’t use centering bolts to adjust the starter The lower stud should be in the bell housing of the sportomatic. The starter it’s self is self centering.

I suspect it’s a translation error, trust the German not the English translation. Use bolt dimensions and disregard the centering interpretation.

Thank you for your help!