Grammatical explanation of 「X～Yのうち、いずれか一仕様とする」 expression

Question

I came across the following sentence:

(1)、(2)のうち、いずれか一仕様とする

After the sentence there are two options listed. From the context (a guide on how to fill in a form to request quality evaluation) I understood that the meaning is something like "Choose one specification between (1) and (2)". Looking it up on google I found out that it's a fixed expression often used in forms (see here). What I don't understand is:

1) why the verb used is simply する and not a specific one indicating a choice (like 選ぶ or 選択する)?

2) why is the dictionary form of the verb used and not the -てください form or something similar to express a request?

Thank you for your help!

EDIT: for more context, this is the instruction on how to fill the section in question: 申請仕様が複数存在する場合は、「(＊)～(＊)のうち、いずれか一仕様とする」と表記して下さい。

Answer 1

1) why the verb used is simply する and not a specific one indicating a choice (like 選ぶ or 選択する)?

Because 「する」, all by itself, has the meaning of "to decide by selecting". デジタル大辞泉 says the following:

㋕…であると判断をくだす。みなす。また、決定する。選んでそれに決める。

「まあ、これでよしとしよう」「友をよき競争相手とする」「出場を取りやめにする」「私は、コーヒーにする」

Moving on...

2) why is the dictionary form of the verb used and not the -てください form or something similar to express a request?

Easy. That is because it is not a request to begin with. Re-read your own EDIT. 「(＊)～(＊)のうち、いずれか一仕様とする」 is what your company will be stating to the Ministry, which is why it says 「(＊)～(＊)のうち、いずれか一仕様とする」と表記して下さい。.

「表記してください」 is what the Ministry is asking you to do and it is already in the "request" form.

The dictionary form is VERY often used to talk about (near) future, as I hope you know.