Hi,
It seems to me 98' Stella is the blue version, which is 10000FA version or SW10000HG for jdm.
STL16000F was the previous series, silver colour:
But spare spool for SW10000HG and SW20000HG for jdm reels was a spool SW16000, which is fully OK for 10000FA and 20000FA reels. This spool has gold colour:
This spool SW 16000 has reference SC 79R, and contains 300m with PE 6 braid
diameter of the spool is slightly bigger than original 10000FA spool, aroud 7cm, which provides (with full spool) a 132cm retrieve for 10000FA (6.0 ratio) or 99cm for 20000FA
hope this helps,
cheers,
Alexandre