All P-RU638AA currently on IMCDb should be renamed "Blue Ribbon", with the current name moved to the chassis code.

https://ja.wikipedia.org/wiki/%E6%97%A5%E9%87%8E%E3%83%BB%E3%82%BB%E3%83%AC%E3%8- 2%AC#%E3%83%96%E3%83%AB%E3%83%BC%E3%83%AA%E3%83%9C%E3%83%B3RU60%E3%83E3%83%BBRY63- %E7%B3%BB%E8%A6%B3%E5%85%89
https://www.imcdb.org/vehicles_make-Hino_model-P-RU638AA.html

Chassis code should be [P-RU638AA] or just [RU638AA] as the alphabet before the hyphen is for the emission code and not for the actual chassis.