1 ¼” ball valve and possibly 2 each of a 3” ball valve or gate valve that have metal seats and meets NACE MR0175 SPECIFICATION FOR SOUR GAS SERVICE.
Stainless steel construction, and 500 psi operating pressure are other requirements.
There are many companies that can provide the product you need. However, if you are not already aware of it, the NACE specification you reference was revised last year, and the scope changed significantly.  For the sake of your wallet, please be certain that you really need to have the materials comply with the current MR0175 edition.
There has been a lot of confusion on this subject and to simplify, if your product is on the "well side", and there is chlorides in the fluid, then the current edition of 0175 is applicable.  You will need to either review the specification and tell the manufacturer the materials they are to use in the valve.  Or, tell the manufacturer the fluid details such as partial pressures, etc., so they can select appropriate materials.
If the product is on the "plant side", and there are no chlorides, then the new NACE spec. MR0103 applies.  Now the confusing part.  MR0103 is essentially the same as the 2001 edition of MR0175, and you do not need to tell the manufacturer anything other than simply, "the materials need to comply with MR0103."

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