I have both old and new aka and they are interchangeable on the AI's.
Here's a link to a Hobie catalog with parts for our boats: http://static.hobiecat.com/digital_assets/2012-spring-kayaking-fishing-pa-catalog_1.pdf
I think what you are looking for is the aka brace assembly, or their parts.
79523101 AKA BRACE ASSY V1 (L)
79523102 AKA BRACE ASSY V1 (R)
79524001 CAP / AKA BRACE LOCK
79523001 SOCKET / AKA BRACE LOCK
81242001 SPRINg / AKA BRACE LOCK
8030781 SOC CAP SCREW
8032081 SHEAR BOLT
79536001 BRACE CONNECTOR
8020381 CLEVIS PIN
20860000 SPLIT RING
On the cracks, if they are truly cracks and not seams from the weld, a good welder may be able to repair them. Otherwise old style:
79520001 AKA FWD (L/R)
79521001 AKA LEFT REAR
79522001 AKA RIGHT REAR
The new style would require replacing the XBAR's also, so would be more expensive, but newer style.
- - - - - Hobie Island Sailing since 2006 - - - - - 2011 & 2012 Hobie AIs and a 2012 TI