excel g are at the cheaper end of the market - what are you intending to do with the car? that should determine what kind and length of insert to use.
re: rears, drill a small hole in the rears near the base of the strut - you'll get oil everywhere but a much safer way of doing it that with the grinder at the top (oil, heat and sparks combined are not ideal). Weld up the hole when done.
Get a second pair of struts to donate the threaded section for the rear (any will do as long as the ID and thread is right) then trim off the top section of the donor units. Fit coilover tube to rear strut tubes slide donor top section down inside and weld to coilover tube at height to suit your inserts.
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