Allen,
I have updated the build manual with the P/Ns. Here is a link to the manual:
www.modelgasboats.com/images/s...s_R20121004.pdf
Strut: Speedmaster P/N: SPDS-010-250MR 1/4" Strut XTD assembly (strut brackets should be 2” long)
Rudder: Speedmaster P/N: SPDR-013-1SB or the SPDR-011-60SB, 60/90 Rudder
Assembly. Both of these seem to work equally well on the boat. The first is a straight blade, the second is a tapered blade.
I use Hitech 755MG 1/4 scale servos on steering. Anything with around 200oz of torque should be fine.
Hope this helps.