The new smaller snap pins that hold the bars to the hitch are a commonly sold item at TSC and come in various sizes and lengths.
Those larger, thicker L pins that hold the sway bars to the L bracket I think are specially made for use with the Equal-i-zer. I have been up and down the isles of my local TSC and have never seen anything like those L pins anywhere. I may be wrong, but I think those are made specifically for the Equal-i-zer and are not commonly available as a hardware item outside the realm of RVs.
Please let me know if I am incorrect, because I would love to be able to buy those thick L pins locally from a hardware or farm store.