From the guide:
Forms Needed to File for a K-1 Visa:
1. I-129F
2. G-325a
3. G-1145 (optional)
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If it lists these documents, then it means exactly these documents. One says optional. The G-325A does not say optional. To be successful in this process, one needs to read accurately and interpret literally. It says G-325A, so send G-325A.
Then there is a step-by-step guide that lists all the evidence to send, taken largely from the instructions from the I-129F. That is a good read too. Line by line, read it, supply what it says, line by line.