Sorry no pics right now, camera on load to my daughter. I used some foam from one of my AR15 pistol stocks. It was small enough diameter, soft and flexible so it would not hinder with mag insertion. If you can purchase the spacer that goes on the high-cap magazine for the 24/7 compact in 40cal. from Taurus, there should be no reason that you couldn't use a full size 24/7 40cal magazine in your PT140.
When I modded all my EAA Witness 9mm, Beretta 92 & CX4 9mm mags to fit my Taurus 24/7's and Taurus PT92's, the only side affect I sometimes ran into was the slide not always locking back after last round. I never had this problem with the 24/7 45cal and PT145 but I suppose it could be possible, although unlikely. Just thought I'd mention it...