Hi guys, I also noticed that some stadiums in the 1950 World Cup (Brazil) can be applied to some big brazilian clubs of this era.
Maracana - Used by Flamengo, Fluminense and sometimes by Botafogo and Vasco da Gama (those two had their own stadiums but played the big matches in Maracana). It had a reform only in the 1990's, so it can be assigned to these teams until them. But if you want to be more precise, in the 80's there are some adboards that were added and made the stadium a bit different.
That version of Maracana can be downloaded for FIFA 14 here, if someone can convert:
https://dl.fifa-infinity.com/fifa-14/classic-maracana-stadium-pack/
Pacaembu - Used by Corinthians until 2012. It was created in 1940 and it had a reform only in 1970, so it can be assigned to all Corinthians squads in this period. After 1970, I only found a version for FIFA 14 in the stadium pack below.
Estádio dos Eucaliptos (Estadio Ildo Meneghetti) - Used by Internacional until 1969
Ilha do Retiro - Used by Sport (I don't know if there is any Sport Squad in the patch, honestly)
Brazilian stadium pack for FIFA 14 I mentioned is in the MEGA link below. It includes the after 1970 Pacaembu and also the Vila Belmiro, Santos' stadium that can be assigned to Pelé's Santos squads:
mega.nz
Got it from here:
https://viciofifa.blogspot.com/2014/03/do-brasil-blz-aflitos-alfredo-jaconi.html
If you guys want any help with Brazilian teams info, feel free to reach me. I also reached a stadium creator that made retro brazilian stadiums in PES 2021, so if I get his stadiums you might have HD retro stadiums from Brasil for the patch in the 80's and 90's