I'm not sure I'm reading you right, are you needing the Alternator bracket?
When you said you have a C shaped bracket. Is this what you have?
If so, then this is what you need to complete it. J, do you have one?
There are a couple different brackets used over the years for both AC and Non-AC cars. If your car has an AC compressor then you'll need one of the setups on the drivers side. The passengerside alternator bracket can be used if you don't have AC.
If you wanted to add power steering here's a pump with the three pieces of brackets that you would need. If it would help I can get pictures of each of the three pieces. John