Volvo: Volvo 850 94 Timing Belts & Tens, coolant line, timing belts

Question
Sir,
I have a 850 non turbo 1994 engine B5254S, I would like to purchase the timing belt and the tensioners and pulleys but when I went throught the net looking for those pieces I see that there is a note that says that I have to check if my engine is before 131034 or after 131035, well someone told me that my engine number appear right on the Timing Belt plastic cover, well I see that there is a sticker with two numbers one over the other , at the upper part of the sticker is 1289959 and below is the number 166816.

My question is , is the number 166816 the  engine number and logically it is after 131035 and the parts number that I have to buy is the one that is for engines after 131035 ? or I am wrong , please your comments and help, thanks

Answer
Alfred,
I think that you have the right number. I usually see the words serial just above the or below the number, so check that out. That number is also stamped in the block just below the head on the side toward the firewall close to the coolant line from the water. It faces up to make it easier to see.