I did it the other way I have a 95 E300D the original engine was a 606 and I replace the 606 with a 603 and I used all the accessories from 606 they fit you can use the accessories from a 603 into the 606
I did it the other way I have a 95 E300D the original engine was a 606 and I replace the 606 with a 603 and I used all the accessories from 606 they fit you can use the accessories from a 603 into the 606