I must admit to using stainless nuts and bolts on the Scotts that I have restored. In mitigation I make them on my lathe to the original Scott dimensions. Vintage Scotts had dull nickel plated fastenings so modern bright nickel is not correct. By 1930 Scotts were using a blacked finish on some of the fastenings as a cost saving.
Highly polished stainless is too “white” to replicate nickel, but let it tarnish and it does become more yellow. It also has the advantage that there is no plating to flake off when using spanners and the finish will last..
After a while most faster get covered in a film of oil and dust anyway. 😀
