It looks like a 22D or 28D box with suffix D,E,F or G.
Anyway the main housing got a steel sleeve, that's good.
The damaged hole/dowel looks like a fork lift disaster.
Nevertheless I would ask Dave for some $$$.
The dowels are needed to line up the input gear of the LT230 to the mainshaft of the R380.
Interesting detail:
One M10 stud is supplied, the lower one is missing.
These studs are common during the early versions of this LT230. The lower one needs to get out when dismantling only one of the M8 bolts of the small side cover.
Later transmissions had been connected to the R380 by short M10 bolts.These likely would missmatched with the longer uppermost M10 bolt. This mistake caused a thread failure inside the main housing.