Those are HT-HG era part numbers. They aren't in the 11/71 HQ parts catalogue, but they are in later revisions. Same part numbers are in HZ and WB catalogues.

A09 isn't listed as a mainstream option in the mid-HQ commercial order procedure I have, but neither re many options - they go in the OTHER OPTIONS (unlisted) section of the order form. I'll have to check up the full HT-HG options list and see if A09 is there.

Just a coupe of obscure options I didn't realise existed:

D43 - Internal rear vision mirror (this was actually an option on cab-chassis)
A82 - Head restraint (head rests), optional in early HQ

The one that surprised me the most recently was it was possible to delete RTS on HZ cab chassis. You got rag tyres and no RTS badges. Lots of others too like ladder rack and canopy, sign holders, delete battery, fire extinguishers etc. Many of them are Govt or export only hence why they are obscure. There was a BT1 Police pack in HZ as well which surprised me..