WTB: double OMS 45s

I'd like to make a set of small doubles, OMS 45s. I already have one 45 and an oldish OMS manifold (face sealed O-rings).

-Does anyone know the length of the center section on the mainifold for double 45s? Mine is 6 5/16".

I'm looking for
A) one OMS 45.
B) Bands
C) manifold center section if mine is the wrong one...

Thanks.