Doesn't make sense
Your Stinky has a 7.825" iei shock and you want to install a 9" iei shock - The iei length of a shock will not change w/ a shorter or longer spring. Provided the suspension linkage can compensate for the additinal 1" you just messed up the bike geometry. You need to re- read the answers on your DH post, even question your own question. Save your money and buy the CORRECT shock stop trying to re-engineer your bike.