gen 3 glock 19 factory front sight size?

Running a blacked out factory rear and factory dot front (that repeatedly falls out) on my range/class g19. Wanna replace the front with a threaded aftermarket option that maintains factory sizing. What am I looking at? White dot would be nice.

http://www.ameriglo.net/catalog/sights/pistol-sights/glock/painted-dot-sights/front-sights

i’m thinking the bottom one on the list may be what you’re after