Single piece lowers make them 97+. Sls were still yellow in 97 with different adjusters to yours pictured. Also would have had an alloy steerer and titanium v bosses.
1997 for sure, but this was a Judy XC color combo, not as popular as white/red or black/yellow, but definitely out there. The Thin Air of that year definitely had them on. SL's should've been yellow with black core stickers, but who knows what special this may be...