Your kit includes twin bevel geared diffs F/R/C, and if you want, you can upgrade to quad bevels like all the models above it. You'll need 1 bevel shaft, 2 bevel gears, and 2 shims per diff.
So all up you'll need 3 shafts, 6 bevel gears, and 6 shims.
More importantly, the sports/readyset diffs have main gears made out of softer cast aluminium, which may eventually strip. You can upgrade to the machined/hardened steel gears that the regular kits and above - these will never strip - mine still look like new; absolutely no wear.
It might be worth just using those stock gears till they go though, otherwise it would be a bit of a waste... I do know that they won't strip too easy unless you move to something with much, much more power than the stock engine.
If you got money lying around and nothing to do with it - its worth upgrading the diffs. Otherwise, you should be able to live with those fine.
If you must have part numbers, I can find them for you, but checking the back of your manual or kyosho website would probably be quicker.
Good Luck
-uDi