The full sized Bob is pretty big for the 16, but there was a kit with all the hardware.
https://media.hobie.com/item_attachments/30113z52.pdf
8010121 RIVET POP 3/16x5/8 PH-SS 2
8010141 RIVET 3/16 x 3/4" PH-AL 1
8010181 RIVET POP 3/16x1/4 PH-SS (ABA) 4
8011291 RIVET CAP 15/64 SS 3
8080711 WASHER 5/8x1-5/16 SS 2
36600031 BEARING 5/8 X 1-3/8 X 7/16 2
36600040 COTTER RING 1-1/8 X .072 1
38120011 EYESTRAP-LRG SS 2
36600011 SHAFT (1)
We don't have all the parts. One is just a PVC pipe as a spacer.
The bearings are in stock as well as rivets and straps... and the shaft.
Or a better fit:
30115 MAST FLOAT KIT WV/H14/16 "BABY BOB"