Well I am sure about this. I think I also bought the SCEA II assignment in 2007 sometime (probably March 2007). I thought I will complete it in a month or so. But....

happens, and I couldn't even go thru the assignment before April, 2008. I was under the impression that I can't take part II because the old exam had expired. I saw a discussion
thread in this forum, which mentioned that SCEA II assignment can be taken before 31 Dec, 2008. The part III voucher is the same for all the exams therefore it doesn't matter whether I have the voucher for SCEA Part III or not.
This is the email I received from Sun in June, 2008:
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Hi Ashish
Kindly note that if you have procured your Old SCEA Assignment before 29th February 2008 then you can complete/ submit the Assignment before December 2008. Subsequently if you submit your Assignment before December 2008 then you can write the Old SCEA Essay exam but then the same should also be completed by December 2008
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HTH
Ashish