I'm thinking AE may be correct here. If it doesn't have the S at the end, it's likely the black nitrile. The biggest difference then might be if the FL1-A has thread end bypass, as many, but not all MC's do. Some folks prefer thread end, to me it not a big deal either way.
The L30001 should be just fine for a ~5k/6month OCI, and 97.5% efficient ain't too shabby. Use with confidence.