Rivet on F-01457

There is a rivet on the F-01457 gusset that is kicking my backside. It is the rear most 426 rivet that is located in the "match drill" hole. I can't find a bucking bar that I can get into the area. It is inside the longeron, which is 1 1/4" high. There is also about 5/8" of space between the sidewall and a bracket. The bracket is thick enough so that I can't compress the rivet because the bucking bar stops on the bracket.

I'll try for pictures of the area, but it looks like I need an L bar. Brown tool has one, but it is .1 too high. https://www.browntool.com/Listview/tabid/344/ProductID/3059/Default.aspx

Here is the rivet that I'm having difficulty with.

make a bucking bar

I needed something similar for my 6A and made a couple of bucking bars cut from scrap 3/8" steel angle with an angle grinder. Pics attached. Or maybe a footed bucking bar would work in your situation?

Thanks Paul,
I have the one on the right, but the bracket kept it from compressing the rivet more than a slight bit. Here is what I ultimately came up with and it worked fine along with the bucking bar. It was a wizard 1/2" punch from my grandfather's Western Auto store he used to own. I've got a few Wizard tools and a 1/2" drill that takes two hands to use!

Hi Jeff,
Glad you got it sorted out, that is creative use of the Wizard punch, I'll bet that neither your grandfather nor the Wizard Co. envisaged it being used to one day set a rivet! A happy result
Cheers Paul.