I am going to reiterate, it is not a good idea to put a new chain on to old sprockets.
There is more than an even chance that the lovely new yellow chain will be as stretched and as worn out as the old one within a few hours of riding..
The reason for this is that the sprocket teeth will not match the distance between the rollers of the new chain.
There is a chance that the old sprockets will make the new chain ride up , tighten and then break , and that may take a case out.
Some more dollars spent now on a complete set, may save you some headaches and some dollars later.
Play it safe bro New chain.... new sprockets!