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i purchased a Giant trc advance on ebay: Blue White Bicycle frame Bicycle accessory Electric blue Yellow Automotive tire White Black Automotive wheel system it came with a bb marked "truvativ sealex",i tried fitting a Shimano 105 crank i had i failed? what crankset fits or compatible,this is stressing me out i need help please..;0-((
 

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I don't know for sure, don't have time to search around but I can offer some ideas.

First off I think you have a Sram GXP bottom bracket now. Your 105 crank should go in one side but not the other. One hole is 24mm the other is 22mm.

Secondly, I think that's a press-fit bottom bracket. Quite possibly the Shimano pressfit standard of BB-86. SM-BB-72-41B is the code number of the one you will probably end up buying to replace the one you have now so you can use your 105 crankset.

Third and last is that you REALLY should take it into a local bike shop to have them properly remove the bottom bracket there now and install a press-fit Shimano one for you.
 
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