Looks very similat to TA and REG cages which are easier to find. Curious, why OGK in particular?
I recently discovered VO Stainless steel bottle cages. You might want to check those out if you want something with impeccable craftmanship (much better quality the King Cages, IMO) and super light weight, (lighter than Aluminum cages). It just replaced my previous favorite Blackburn aluminum racing cages on my bikes wich I had been using since the 80's

Chombi