Details from the RigRite web site:
Isomat NG-60 Mast
Measurements (OD): 8.07" x 5.39" (205mm x 137mm)
Wall Thickness (minimum): .130"
Weight/ft.: 4.03 lbs.
Moments of inertia: Ixx = 26.43", Iyy = 12.73"
Circumference: 22 1/8"
Alloy: 6061-T6
Sail slides: 15/16" flat slides (A008M)
Standard Mast Lengths: 50'10" (15,500mm), 54'4 (16,570mm)
Common Mast usage: Bayfield 36; CS 36, 36M; Condor 40; CT 56K Miz.;
Express 35; F&C 40; Formosa 56K Miz.; Island Packet 35, 350, 37;
Mamba 39; Omega 42; Pearson 33*, 385, 386; Union 36*;

Isomat NB-40 Boom Section
Measurements (OD): 5 7/8" x 4 3/8" (150mm x 110mm)
Wall Thickness: .110"
Weight/ft.: 2.71 lbs.
Moments of inertia: Ixx = 11.22", Iyy = 4.97"
Circumference: 17 1/2"
Alloy: 6061-T6
Sail slides: 1/2" round slugs (A018, A118) or 1/2" boltrope
Standard Boom Lengths: *
Common Boom usage: Bayfield 36, 40; CS 36, 40; Beneteau 1st 42*;
Cal 39; Endeavour 42*; Express 34; Freedom 28, 30; Hunter 35*, 37*, 40*;
Island Packet 38*; Morgan 41*, 43*; O'Day 40; Pan Oceanic 38;
Pearson 33*, 36-2, 37; Tartan 40; Tayana 42*; Whitby 42;

From: "jim lassiter" 
To: 
Sent: Wednesday, June 16, 2004 21:06
Subject: Re: [Pearson] Gas strut for icebox P33-2, P31-2


> I have an 88 P31 II and I replaced the strut with an
> Attwood SL36-60-5 (17"X 60lbs)that I bought from West
> Marine. It fit perfectly and has worked fine for 3+
> years.  jim lassiter  P31 II #195  Victoria