Are you after part numbers or gear ratio?
What do you mean " size"
It is neither a evinrude v4 or v6 box as used on all the ficht and 2 strokes of that era as far as I know. I am not 100% sure it is a rude box? If it was it will have common parts except driveshaft and gearchange . I can't remember but was that the same time as they were doing models in conjunction with Suzuki?
Sorry to many brain cells killed in action - and it isn't even Friday night
Parts diagram
http://www.boats.net/parts/search/BR...ASE/parts.html
Edit - found link
My Brain ,may be dead but here is a link to answer your question I think
http://www.boatpoint.com.au/engine-r...r-strokes-8206