H1B Re-stamping via drop-box and approved extension valid for 4 months

Hi Team,

currently I am in USA and planning to visit India in the month of Oct’2014 to Nov’2014.

My first petition approved for 1year and it got expired on Dec’2013. In that period I applied for extension and now I have approved extension till Mar’2015.
So, if I am visiting to India in the period of Oct’2014 to Nov’2014 I have to go for Re-stamping.

I read all the steps mentioned in http://www.ustraveldocs.com/in/in-niv-visarenew.asp
After going through steps I found that I am eligible for ‘Drop-box’ IWP because “my prior visa in the same classification with the same petitioner is still valid or expired within the last 12 months”.

However I am worried about my approved extension date. My approved extension will expire on 5th Mar 2015 and I am attending drop-box in Oct’2014 end. So here, I am attending stamping where my visa validity remains for only 4 months. In stamping rules its mentioned that passport should valid for 6 months but no clarifications/eligibility criteria for approved petition validity.

can anyone suggest if 4 months validity will create any problem for my stamping?