So if I am looking at the specs for a replacement crank set, what numbers should I be paying attention to? The Shimano specs state:

FC MODEL # CN SP LGTH 47.5 CN LINE SP LGTH 50 CN LINE SQR TAPER INTERFACE
FC-MC08 110 113 X

then I should be ok swapping in:

Sugino Impel 150X triple mountain bike crankset is 7- and 8-speed compatible.

• 7/8-speed compatible
• Spindle Interface Type: Square Taper JIS
• Spindle Length: 113, 110mm

I just want to be able to do this the first time with out trying to return parts and losing more time.

Thanks everyone again