Conversation Between DrTurbo and BiggO

I owned tha older T-76 turbo which i was told tha HP78 has tha same compressor cover as tha T-76......HP78 compressor looks smaller then tha T-76 more lik 60-1(TC-78).Did tha HP series take take place of tha T series?Tha diametion of tha HP78 is not matchin up with tha T-76 series compressor cover diametion
This is what i have now...
SN T-40940
T_SE-SB-H78-D-D-68
One off tha backing plate has T-40940 other T-40941