Help to Identify Make of Sliding Seat Mounts

[tuckerj]

I have taken this picture from the for sale adds for reference as I am trying to identify who makes these sliding seat mounts, can anyone help?? (I have pm’d the seller)

Also do you know if they bolt to the car using the standard seat mounting points?

And if the standard seat belt plug can be removed from the pre-tensioner, or will i need to buy a new plug without pre-tensioner? (for use with standard seat belt obviously)

Thanks!