Help with seat mounting

[thor68]

Hello,

I bought a dofreality H2 and a cheap bucket seat. The bucket seat seller said it can be mounted on 405mm consoles.
But the drill holes on the bottom rails of the seat are only 396mm apart. On the H2 seat mount rails the drill holes are 405mm apart as expected. As a result I can't mount the seat onto the platform, at least not directly.

Am I missing something? Is there some kind of console adapter I need?
Otherwise, can someone give me some pointers for the appropriate mounting procedure?

Thanks