[mrrec]

Dennis:
A number of different suppliers (Goodyear, Gates, Goodrich probably and more) provided hoses to Chevrolet. As you note, the part numbers and suffix codes are the same as Chev specified. Problem is, each supplier used his own date, plant and shift codes, etc. Some date codes are pretty obvious - others are tough. Font and size also varied.

02 20 and C12 are Feb 20th and March 12. I believe the "70" may indicate the model year.

Not much help here, but it's what I know......
Dave