Question: How many seats are in the stadium that hosted the 1998 Copa del Rey Final?

Context articles: 2011 Copa del Rey Final
2015 Supercopa de España
1996 Copa del Rey Final
2014 Copa del Rey Final
1998 Copa del Rey Final
2015 Copa del Rey Final
2013 Copa del Rey Final
Mestalla Stadium
1992 Copa del Rey Final
1977 Copa del Rey Final

The 2011 Copa del Rey Final was the 109th final since its establishment.
 The match was a traditional 'El Clásico' rivalry between Barcelona and Real Madrid which took place on 20 April 2011 at the Mestalla Stadium, making it the sixth such Copa del Rey final (the last one was played also in Valencia on 5 April 1990), just four days after the two teams played each other in La Liga and seven days before they played each other in the UEFA Champions League first leg semi-final.
The 2015 Supercopa de España was a two-legged football match-up that was played in August 2015 between Athletic Bilbao, runners-up of the 2014–15 Copa del Rey, and Barcelona, the champions of 2014–15 La Liga and the 2014–15 Copa del Rey.
 It was also a repetition of the 2015 Copa del Rey Final.
The 1996 Copa del Rey Final was the 94th final of the Spanish cup competition, the Copa del Rey.
 The final was played at La Romareda Stadium in Zaragoza on 10 April 1996.
 The match was won by Atlético Madrid, who beat Barcelona 1–0, meaning Atlético completed the domestic double.
The 2014 Copa del Rey Final was the 112th final of Spain's premier football cup since its establishment.
 The match was an "El Clásico" between Real Madrid and Barcelona on 16 April 2014 at Mestalla in Valencia, making it the seventh such Copa del Rey final (the last one was also played at the Mestalla on 20 April 2011).
 Real Madrid won the cup for the 19th time after a 2–1 win.
The 1998 Copa del Rey Final was the 96th final of the Spanish cup competition, the Copa del Rey.
 The final was played at the Mestalla Stadium in Valencia on 29 April 1998.
 The game was won by Barcelona 5–4 on penalties, after a 1–1 draw following extra time.
The 2015 Copa del Rey Final was a football match on 30 May 2015 to decide the winner of the 2014–15 Copa del Rey, the 113th edition of the Copa del Rey, Spain's primary football cup.
The 2013 Copa del Rey Final was the 111th final since its establishment.
 The match was a Madrid derby between Real Madrid and Atlético Madrid on 17 May 2013 at the Santiago Bernabéu Stadium in Madrid.
 It was the clubs' first meeting in the final since the 1992 final when Atlético won 2–0 over Real Madrid.
 Before this match, the two teams have been finalists on four other occasions in 1960, 1961 and 1975 Copa del Rey; all Atlético wins; except 1975 when Real Madrid won.
 Atlético lifted the trophy for the tenth time in their history.
Mestalla Stadium (Spanish: "Estadio de Mestalla" ] , ] ) is a football stadium in Valencia, Spain.
 The stadium is the home ground of Valencia Club de Fútbol and has a capacity of 49,500 seats.
The 1992 Copa del Rey Final was the 90th final of the Copa del Rey.
 The final was played at Santiago Bernabéu Stadium in Madrid, on 27 June 1992, being won by Atlético Madrid, who beat Real Madrid 2–0.
The 1977 Copa del Rey Final was the 75th final of the Copa del Rey.
 The final was played at Vicente Calderón Stadium in Madrid, on 25 June 1977, being won by Real Betis, who beat Athletic Bilbao on the penalties after 2–2.