Water Pump Replacement 2002 S60 N/A

Installing a new water pump:

1. Start by ensuring that the engine block surface is clean and dry. Use a Scotchbrite cleaning pad to remove the old gasket material from the block.
2. Put the gasket on the block and then install the two bolts together with the waterpump to hold the gasket in place. There are two guidepins on the engineblock that will fit into the two holes in the water pump housing. You may need to use some force to get
them in. A small plastic hammer can be used, but be careful to not damage the gasket.
3. Use the starpattern when you tighten the bolts, and be careful that you don’t over-tighten the bolts.

You can also consult the tensioner instructions for tips on adjusting.

Alright so I have a 2002 S60 N/A with 187k on the clock and am looking to replace my timing belt. It doesn’t look like a hard job and the only things that it looks like I need to watch out for is the timing marks and the tensioner adjustment. Everything else looks pretty straight forward. I am not the original owner but it looks like the t-belt was replaced at the recommended 105k per the Volvo sticker on the ecu.

Now, I’m looking at the contitech timing belt kit that comes with the water pump as well but there seems to be two different part numbers.

There is the TB331LK2 and the TB331LK1. Which one do I need?!

Thanks in advance!
-Billy