ppf-o-matic 3.0 to your game backup.
Patch work with: https://web.archive.org/web/20160806202936/http://redump.org/disc/5238/
Using patterns found at: http://ps2wide.net/
MD5 after patching: EE1138796AE855C947E2763C024DF2A1

PS2 Wild Arms 5 (NTSC-U) Widescreen patch ppf
Patch to made game widescreen