When Porsche replaced Boxster engines, what spec did they use?

[Adrian Thompson]

Hi, I'm going to look at a 99 base Boxster (worse than that, it's an auto!!!) that had a new Porsche engine fitted, buy Porsche in 2005. Since then It's done less than 20K miles.

What I want to know is what engine would Porsche themselves have fitted to a 99 Boxster in 2005? Would it be:
A: Early duel row IMS Bearing 2.5
B: Would it be a 2.5L but with the later single row bearing.
C: Would they have just used the then current engine which would be a 2.7 with a single row bearing.
D: Something else.

I'm hoping it's A actually as the single row IMS bearing seems to have a lower failure rate from what I can tell than the later duel row bearing?

Thanks