TRUGLO Fiber Optic handgun sight set for Glocks, XDs, M&Ps from $50 shipped

Can someone tell me what the difference between these:

Truglo Fiber Optic Handgun Sight Set - Glock Low, Red/Green + FSSS - $50 | Slickguns

and these are:

Truglo Fiber Optic Handgun Sight Set for Glock (Low or Hi) - $52 + Free Shipping | Slickguns

The first ones say "low" and the second ones are "low or hi" -- What's the difference? I have a glock 19, want to make sure I get the best / right ones

the second one links to both low sights and hi sights, your choice

I literally meant what the difference was between low and high, but I figured it out.

In the mean time, I went ahead and ordered the lows from GrabAGun ($8 cheaper than buds).

<3 the comment on Bud's about "I didn't know these wouldn't glow in the dark" LOL

Thanks for the links!