question about lengthening brake pushrod

[19GMC63]

Hey guys,
Figured I'd wander over to the 67-72 board and get yall's opinions.

I recently purchased a MC/Booster combo off a 86-ish 1/2 ton from pull-a-part. I've ran into a problem putting it in my truck though(I know, its not a 67-72, but its the same pedal setup).

The pushrod is about an inch too short. I've searched through the threads and saw where others just used coupler nuts.
The thing is, my pushrod is non-adjustable. Its just one long rod.

So what do I do? No access to a welder either.

here's a pic similar to my setup(pic courtesy RM72Chevy)


thanks in advance