Hi! Can anyone please suggest the right thermal pad thickness for my Inspiron 7586? Thanks

I've had my Inspiron 7586 laptop since 2018 and it still works just fine, but I need to replace the CPU thermal paste.

As I was gathering information, I learnt that a thermal pad is also part of the thermal sinking (for the PCH, apparently), so I guess while I'm at it I should replace that as well, but here's my doubt: can anyone please advise which thickness would be best?
I'll go with Laird Tflex 700, but the seller is listing as many as 5 possible sizes: 0.13, 0.5, 1.0, 1.5 and 2.0 mm.

Unfortunately, this technical detail is not included in the original Service Manual, and in over 2 weeks I haven't received an answer from a single Dell address I've sent an e-mail to (info@dell.com, sales@dell.com, us_customercare@dell.com, us_sales@dell.com, us_cts_support@dell.com); I even contacted Laird, but they understandably referred me to Dell.

P.S.: the thermal pad is the pink rectangle in the attached screenshot from a YouTube video (https://youtu.be/ryTdC0lRtJc?t=138)