Replacement crank arm question

[sirpsychosexy]

Hi guys, first time poster

Scenario: On tropical island with specialized mtn bike hardrock, pedal stripped left crank arm. I am looking to ship down replacement crank arm with tools needed to replace it. Shipping is a big deal and takes about 2 weeks so id like to nail this on the first try. Currently, my left pedal is welded to the crank arm!

Facts: Crank set is Sr Suntour octalink, spline
BB : Shimano BB-ES25, Octalink spline, cartridge bearing, 68mm x 118mm
(per specialized website specs).

Question: I am having trouble finding a replacement left crank arm, the closest one i could find is Sunlite Replacement Left Crank Arm for Octalink SP, 175mm, Black Now, i am unsure on whether or not my current crank arm is 175mm, is that a standard size for specialized mtn bikes? (size 21 if that matters), and I dont know what "SP" stands for??? Also i am guessing i just need an octalink extractor wrench (i already have the 8mm hex), any other tools needed? Any suggestions, clarifications are greatly appreciated.

[nfmisso]

You need a tool like this:
http://www.amazon.com/Park-Tool-Puller-Splined-Cranks/dp/B001N883JS/

with respect to length, do you have a ruler or tape measure?

also see:
http://www.amazon.com/gp/search/ref=sr_nr_n_7?rh=n%3A3375251%2Cn%3A%213375301%2Cn%3A2232464011%2Cn%3A3403201%2Cn​%3A3404731%2Cn%3A3404791&bbn=3404731&sort=price&ie=UTF8&qid=1308151131&rnid=3404731#/ref=nb_sb_noss?url=node%3D3404791&field-keywords=octalink&rh=n%3A3375251%2Cn%3A%213375301%2Cn%3A2232464011%2Cn%3A3403201%2Cn%3A3404731​%2Cn%3A3404791%2Ck%3Aoctalink

[Etmiller11]

I have old murray eliminator, I want to put new crankset on, just wondering what size bottom bracket it would have.

[Joe_W]

Depends on the crank set. http://www.sheldonbrown.com/bbsize.html