Base Pads?

[kneelingatlas]

I just bought a used Tanfo and it came with these base pads on old style .40 mags which I have already set aside for the new K40 mags, so my questions are these:

-are these the H-140 pads?

-will the Grams 9/40 spring/follower work with these?

-what advantages to the H-141 mags offer?

I have run these bases/K40 tubes with the stock follower and it can hold 19, but after #17, the follower gets jammed against the spacer. I assume the H-141's don't fill the gap below the spacer, but will the Grams follower work well anyway with either pad?

Thanks in advance.