I see listings...

by Hoot , Diversityville, Liberal-sota, Tuesday, May 06, 2014, 06:51 (3797 days ago) @ Art

but have no idea regarding availability.

http://www.highstandard.com/index.php/weapons-a-products/parts

http://www.brownells.com/handgun-parts/sights/rear-sights/sight-rear-prod7222.aspx?avs|... Standard__Sport King

Numrich sold out http://www.gunpartscorp.com/Manufacturers/AutoPistols-36540/SportKingM-103-35028.htm?pa...

http://highstandardpartsonline.com/high-standard-sport-king-rear-sight-p-26.html

There appears to be a few others if these strike out.