How to say this in japanese

Planning to go to Rikuro Cheesecake when I go to Japan in a month. I saw that their menu and they had confectionaries that comes in sets. For example, the Nikomado can be purchased as 1 piece or a set of 5 pieces. How would you say I want 2 of the 5 sets of Nikomado?

Is it correct to say:

Nikomado wo futatsu no goko oneigashimasu?

Word order is not correct.

---wo hitotsu, futatsu, mittsu .... kudasai.

So you should say:
nikomado goko-iri wo futatsu (or futa-setto) kudasai (or onegai-shimasu).

two of 5-piece nikomado.
nikomado, goko-iri, futatsu.
ニコマド　五個いり　ふたつ
an item name, a set menu name, then finally the number (of set menu) you want to buy.

if you want to say politely,
nikomado wo goko-iri de futatsu onegaishimasu.

No need Japanese.
Just say "Nicomado 5 set/pack/box 2 pls!"
or "5 Nicomado 2 sets pls!" in EN enough.
Store staff is not such stupid.

Some stores doesn't using showcase for Nicomado.
https://s13.postimg.org/afdqypn13/nicomado.png
http://www.rikuro.co.jp/shoplist/
(note)
137Y/1p, 638Y/5p was older price sales tax 5% price until 2014 Mar.
Now 141Y/1p, 702Y/5p include sales tax 8%.
http://www.rikuro.co.jp/confectionery/

But "Nicomado(Rikuro's product name of madeleine/マドレーヌ)" is not so taste big different than other stores/maker's one.
https://en.wikipedia.org/wiki/Madeleine_(cake)
This is mini/petit(e) size packed but around 300Y/30p no bad.
https://pbs.twimg.com/media/CqthWedVIAEbrPS.jpg:large