I've ordered from here: https://forum.guns.ru/forummessage/371/2378208.html
There is a link to their website in the topic, you can contact them and ask if they ship abroad.
There are 2 types of stock/forend for IZH-27: old one / new one, and there are different mounting seats for steel parts, see pictures below. If your gun is 1976 you have "old type", note it while ordering.
"old type" before 1988 = "старого образца"
"new type" after 1988 = "нового образца"