You can start the Toro parts viewer here:
https://lookup3.toro.com/partdex/default.cfm
Give it your model and serial number to get the correct exploded view.
Do you have parts missing/broken? The 724 carb is pretty easy to access and
get functional. The carbs for 38050 are available from lots of parts places
but generally cheaper from EBay or used from a local list like Craigslist.
trouts