Thanks, AJ!

so, I cut both ends of the first and second wire from left to right. Peel their ends toward the SSD, and join them insulated. Leave the other two ends toward the motherboard in the air???

I'll probably need to find an original extra cable first, just in case the SSD fails and I need to go back to HDD.
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Roland RD700 exp., Ketron Audya5, Ketron MIDJPRO, TC Helicon Harmony-M, EV N/D967, Shure Beta58A, Roland FR4X, Yamaha PSR SX900