It isn't just the belt you need the whole kit to do it properly. Everything the belt touches and then some.
Like this for instance:
https://www.idparts.com/bew-timing-belt-kit-p-511.html
Plus the correct tools to do it yourself or find someone who knows what they are doing on the trusted mechanics list.
Here is someone off of the list.
Chad Stoughton
EuroTec Automotive
1107 S West St, Suite H1, Wichita, KS 67209
(316)250-5900
ChadStoughton@att.net
https://www.vcarshops.com/kansas/eurotec
There was another person who posted here that worked from his house or mobile. I don't know if it was this guy or not. Had some good reviews though. You could search for him or I could help look/search if you need me to help.
I would assume it hasn't been changed and should be done immediately. Then general rule is when you don't know, do it now. Huge costly damage if it breaks. There is no way to tell without service history. Looking will tell you nothing. It isn't the belt that is usually the issue. Generally one of the idlers or rollers or tensioner goes bad and takes the belt out.
Also there used to be a small tag on the
TB cover IIRC that had the original timing setting listed on it. Yours is probably long gone or unreadable but I would research this and look at it to see if it is still there. You will need VCDS again to fine tune it back to this number if possible. If not a little trial and adjustment a little at a time may be needed to get to the optimum setting on the PD engines, from my reading. There are posts here about this particular thing.
Member Franko6 has quite a bit of knowledge on these things as well. A call or post might get you some more great info as well, especially if you DIY.