Sight
Hi Sally
I have not the faintest idea what a Diana Air king is so googled it, and it appears to be a sporting rifle. My knowledge is purely target rifles and I have no idea what the dovetail size is. Looking at the pictures of the rifle, you may have a spot of bother fitting a proper target front sight tunnel, so I would check that out first before you get too deep in.
I have an un used and boxed Gamo sight (as used on the AA200) with an 11 mm dovetail, the same as the Anschutz size, if it fits and you wish to go that route.
Robin
Walther KK500 Alutec expert special - Barnard .223 "wilde" in a Walther KK500 Alutec stock, mmm...tasty!! - Keppeler 6 mmBR with Walther grip and wood! I may be a Walther-phile?