Project SC300 Road Racer: Part 28 – Getting Safer with Sabelt
man in purple t-shirt attaching side mount bracket to racing seat
Barry temporarily installs the side-mount brackets so that we can put the seat into the cabin to take some measurements.

Note that almost all FIA/SFI seats have a standard side-mount bolt pattern, and just about every manufacturer makes side mount brackets in both steel and aluminum. I didn’t need any additional adjustability that the Sabelt brackets offer, so I kept my existing brackets. However, if I wanted more tilt or more height, the Sabelt brackets have a lot more mounting holes.


operating a chop saw
Square tube steel is cut and angled in order to form a square mounting frame that will be welded into the car.


three square steel tubes with right angle cuts at their ends laying on a work surface with a ball peen hammer
Each section of tube is cut at a 45-degree angle and then everything will be welded together into a square frame.


two square steel tubes secured in a right-angle jig and a clamp holding everything together
A jig is used to clamp everything together so that the frame is as straight and true as possible.


man in purple t-shirt with America eagle welding mask being illuminated by weld arc as he welds
And then the welding.


man in purple t-shirt measuring and marking side mount bracket on square steel tube frame
Measurements are taken of the side mount bracket to determine where the mounting holes should be drilled.


  1. As usual, a very well written article. Thanks, Erik! There is a lot of good information here and I hope that your next update IS about that well-deserved track time. I do have a question, though. At the bottom of page 2, you mention that “The factory seat brackets had been cut and channeled to accommodate flat bar which then had threaded holes installed onto which the seat mount was attached.” So, was the newly installed seat and bracket attached to the old flat bar setup? If so, why didn’t you have Robinson remove the flat bar and do a full install by not using any previously fabricated components? Not to detract from the work done (which is awesome), just a curiosity. Thanks.

    1. @BANSFTC
      Yes, if you look at the last picture on page 2, those are the “original” mounts that were fabricated by the cage builder (different shop). It’s basically flat bar fabbed into the OEM seat mounts. On the middle of page 6 you can see that Barry ground the paint away to expose bare metal, and then welded his new square frame directly to the flat bar that was already there. So, the OEM seat mounts have flat bar welded to them, and then a square frame welded to that.

      Barry felt that the existing flat pieces were welded well enough into the chassis that they would be a suitable mounting point for the new frame. It would’ve been extra hours to chop all that stuff out.

      The other thing is that the OEM mounts are usually (!) safe enough for rollover and serious crashes in terms of being welded into the car. So, using them as a starting point can sometimes be easier because they are often flat in relation to a floor that is far from flat.

      If I was starting over from a bare tub today, Barry probably would’ve opted to make two bars going from the side rail to the tunnel all nice and welded in and then build the seat frame on top of that, but that’s quite a bit of extra work. You can see from the picture on the middle of page 6 that the floor of the driver side is not flat. So to make it work you end up having to start cutting things out of the floor pan and that gets ugly quick.

      I hope that clears it up!

  2. Fat-fingered my own name. I miss the previous format where we would log in.

    Yes, your reply does clear it up. I was thinking about the cross bars that you mentioned (side rail to tunnel), but your explanation makes it clear why it was done with the existing flat stock. Thanks for clarifying. Keep these articles coming! They’re great.

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