Arreolo's weight is stated as 136¾lbs for his fight with John Feeney at the Albert Hall in 1982 (over a stone heavier than Feeney). He did in fact scale 122¾lbs as reported in BoxingNews.
Cheers, Andy. Arreola was only 19 when he fought Feeney but he dished out a real beating and later stopped Lupe Pintor (corner retirement) and went toe-to-toe with Julio Cesar Chavez.