Basepad Replacement Pin Kit. Here is what Taran Tactical says fits each one but what they say may not be what you expect so also look at the length.
Choose 1 for-
AR-15 +5/6, Glock 17/22 +5/6, Glock 21 +4, Glock 19/23 +4/5, Glock 43 +3- approx 1" long, 25.5mm
Choose 2 for-
Glock 17/19/22/23 +0/3/4, Glock 43 +2, M&P +2/4- Approx .785 long, 20mm
Choose 3 for -
Glock 43 +1, Glock 42 +1,- Approx .375 long, 9.5mm
Choose 3G for -
STI/SV 4G-3mm- Approx .31 long, 7.87 mm
Choose 4 for-
AR-10 +5/6, M&P +5/6, PPQ +5/6- Approx 1.435 long, 36.5mm
Choose 7 for
MPX +11 Approx .352 long
Choose 7G for-STI/SV 4G - 4mm,7mm - Approx 1/2" long, 12.7mm
As advertised
TT basepad pin kit
It's great that Shooter's Connection has posted the sizing/specs chart in the description. The #3 fit the Taran Tactical basepad on my SV mags. You could always buy the longest one (#1) and cut to size if you are unsure of which length you need. Also note that this replacement pin kit comes with 3 polymer tips.