91 seat belt to 89 seat belt???????

[89hatchd15b]

I have a 91 dx hatchback with automatic seat belts (don't know what is automatic about them, they are fixed). The seat belt buckle is attached to the seat but I am switching to a new seat that doesn't have this. The 89 hatchback had the buckles separate and bolted to the chassis. My question is what is the best way to attach these buckles to the chassis. Should I cut the piece of chassis out and weld one with the threads in (I have a totaled 89 chassis that I can take the piece of chassis from)? Or should I take a piece of plate, weld a nut to it and then weld it on top of the chassis?
I don't really want to put 4 points in because it is going to be my daily driver and I would like to keep my backseats.

 

[91civisedaner]

I would use the 89s mounts,you might have to weld 'um on the 91.I've been workin on deleting the automatic belts from my 91 and useing 89 seats and belts

 

[89hatchd15b]

yes they would have to be welded in if I do it that way, the bolt holes are part of the floor pan.