M10 vs M12 Engine mount Bolts

[CruisinGA]

My '74 has M10-sized engine mount bolts.
I bought a P/S pump bracket from wdorry, that included M12 bolts for the bracket, he said he's never had another customer not be able to use the M12 bolts he included.

We're both curious as to what years have the M10 bolts securing the engine mount to the block?

 

[65swb45]

https://forum.ih8mud.com/showthread.php?t=28351

 

[dd113]

https://forum.ih8mud.com/showthread.php?t=28351

As opposed to clicking on a thread of ONE response maybe you could just say:
IIRC, its an F vs 2F thing Bill. Changed with the motors in Jan 75.

 

[IDave]

I think the Grinch was telling him to do a search, Dave....

 

[CruisinGA]

haha i missed that thread. my bad.

I am the customer, lol.

Thanks.