Can someone please tell me the part number or where i can find it for number 1 in the picture. Its the biggest circle. For 2000 jaguar s type v6.

 

Try Amazon for this. they have a lot of pulleys.

 

Your best bet is to download and install the JEPC. We are lucky because it's free and on this site.
JEPC -Jaguar Electronic Parts Catalog.

Also be aware that in Jaguars the last 6 digits of your VIN are crucial to getting the right parts. Jaguar makes many running changes to improve the cars and they don't follow the model years completely.
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My parts book has it as XR8 16256,

BUT, it also states it is for UP TO L86901 Vin number.

My Black car is L85213, and is August 2000 build.

Based on that the Vin it applies to would have to be up to somewhere in early 2001, when M..... took over.

There is no number for Vin past that specified, no idea what happened, coz our Silver car is an 8/2001 build with M>>>> Vin and has the same pulley in place.