In the Arra line the 1322 and the 1321 are different blanks. Both are one piece and the 1321 is for a lighter casting weight range. In either the two piece would be designated 1321-2 or 1322-2.
XSRA is the designation for a factory spinner. If it were a conventional it would be XCRA.
I have no idea why a custom build would have the designation XSRA unless possibly (only possibly) it was a factory rod that was stripped and rebuilt.
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