There are 3 different designs of heat pipe for the FC8 in order to support different motherboard CPU locations and because of the different version of the case, i.e. V2(Evo) and V3(Alpha). It should be noted that the original FC8 V1 is not compatible with the current heat pipes.
Currently, the V3 is supplied with the SH2 heat pipes. These heat pipes are NOT compatible with the V2. If you require the equivalent heat pipes to support that CPU location on a V2, you will need the MH1 heat pipes.
SH8 heat pipes are compatible with both V3 and V2 cases but are designed for the typical thin-ITX CPU location.