World's smallest radar-guided anti aircraft missile?

Factual Questions
1

I was just wondering…what’s the world’s smallest radar guided anti-aircraft missile?

Air-to-air or surface-to-air, either one.

And, if applicable, were there any planned or prototype missiles that were notably smaller than anything in service?

That’s…it, I guess. Can anyone help me out?

2

The SA-7 GRAIL Class.

http://www.fas.org/man/dod-101/sys/missile/row/sa-7.htm

I think.

3

That’s pretty small, but that says it’s infrared guided, not radar guided. (Dang!)

4

Smallest in length, weight, diameter, warhead, or what? Do you care if it is not currently in production or use? Does active or semi-active homing matter?

5

Smallest in overall physical size. It doesn’t matter if it’s in current production or use, and it doesn’t matter if it has active or semi-active homing.

6

There is the dual-mode (IR-RF) RAM. There was also a radar version of the Sidewinder, theAIM-9C

7

The smallest overall would have to be the ship-launched semi-active British Sea Cat GWS-21, 22, and 24.

I don’t know of any smaller that were not produced.

8

I don’t understand the spec on dimensions:

48.3 x 378.5 in (19 x 149 cm)
Span: 165 in (65 cm)

???

9

The metric measurements on the page I linked to are the correct ones.