The 105 came standard in a GX spec, so pretty basic. The top spec was a GXL - some GXLs had autos. I've only seen the auto in the petrol option - as mentioned previously, the majority are manuals. Very few 100s are manuals, especially the VXs.
The 105s either have the 1HZ diesel (no turbo

) or the 1FZ petrol (4.5l straight six) - none of the 100s got either of those engines AFAIK. Most 105s have front and rear lockers, so look for the same rotary locker switch as the 80s have - the 100 diesels with the rear locker have the same switch but only with the "RR" option for the rear locker.
One thing I have noticed with import 105s is they often seem to have chrome rear view mirror covers (i.e the front cover is chrome). Most (UK) 100s either have colour coded rear view mirrors or black. So that may be a visual check you can do.
The majority have cloth & plastic interiors but leather seats were a factory option, so you see the odd one with leather - probably likely to be a GXL rather than a GX.
HTH!
Cheers,