I believe these bolts are 10mm x 125 threads and 22.23mm long. I'd like to replace those as the 54 year old rusted almost stripped ones that I removed I'd rather not put back on. Does anybody know where I can find these special nuts, bolts & lock washers? Most likely they are hardened as well.

Thank you in advance for any tips or directions that may come my way.

19?

https://www.carpartsmanual.com/datsun/Z-1969-1978/axle/rear-axle-drive-shaft/19

https://www.google.com/search?q=39628-E4100

Yes it's 19 on the drawing.

Vintage Datsun and Nissan parts has the bolt kit (39628-E4100) for $95. But there doesn't seem to be any way to add it to my cart, so I've sent them an email.

All the other sites sell the bolt only ranging from 21 to 33 dollars each. I've sent emails out I would like to replace nuts bolts and lock washers

Maybe I'll have some luck on Monday

@Terrapin Z probably has some good quality used ones.