YOU SAID:

My vendors keep giving me out of spec parts and claiming that they are good

INTO JAPANESE

私のベンダーは私に仕様外の部品を与え続け、それらが良いと主張し続けています

BACK INTO ENGLISH

My vendor keeps giving me out-of-specification parts and keeps claiming they are good

INTO JAPANESE

私のベンダーは私に仕様外の部品を与え続け、それらが良いと主張し続けます

BACK INTO ENGLISH

My vendor keeps giving me out-of-specification parts and keeps claiming they are good