Something OE length, a contoured (rounded) front (not square) so it will glide over stuff instead of biting into it, fully boxed bottom so it doesn't create a hang up point, Thru-bolted shock mount (I am thinking 1/4" plates) place to mount a progressive bump stop perhaps a pad for an air bump (if that's your taste)

same ball joint as the top, or a uniball....

Better steering stop stops, Teflon lined?

NO STAMPED METAL!

Oh yea, greasable bushings are a MUST!

I don't even care if it's painted pink