That i cant help you with sorry mate.
My EPC shows that the 3SGE N/A , BEAMS AND TURBO models have the same part number
90105-12187
but th 5 is
90105-10071
Do some searching and ask anyone that has built a 5 engine. Maybe one of the sponsors.
If that fails maybe just buy one OEM and get it measured since all of yours are brocken. Maybe someone can chim in
Im sure they will have one.
As there are a few sizes in their catalogue
10 x 1
10 x 1.25
11 x 1
11 x 1.25
12 x 1
12x 1.25 <<<<<<<<<<< 3SGE , TURBO , BEAMS