Yup, I did some digging over at LS1Tech and I got the skinny. You can look up a '97 C1500 with the 5.7 and get the right part number. Here are some for reference:
Purolator Pureone PL34631
Purolator L34631
K&N HP-3002
Mobil 1 M1-302
Delco PF1218
Bosch 3510
STP S5
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