1970 road runner power brake proportion valve location

hi,does someone have close up picture were brake proportioning valve is mounted. its for a 1970 road runner with originally power drums . I now have front power disc with rear drums.thanks

There was a mid-year change in the prop valve, 2nd pic shows early installation.

thanks for pics. I tossed my original parts out years ago. I have stock power booster and master cylinder for front disc brakes. not sure what proportion valve I should order so stock lines will bolt right in.thanks