Its somewhat expensive to get the supermicro fans here in Europe, i was lucky and found this seller for them in germany, Supermicro Hot Swap Gehäuselüfter Fan 0074 FÜR SC743 | eBayPlease take pictures of the procedure if you are able too. Even though PigLover and others have make great guides in this thread, the more documentation is better.
My moddingskills is limited to swapping out fans and connectors, and I havnt bought any replacement parts yet.
However it looks like he only has two left for the time being. I used them to do the fan-mod in my C6100 but i think my closet where it is running is to small so not sure where to put it now...