I bought the D2D plate a few years ago and put it on one of my 64 Barracudas. It works well and has given me the benefits of HEI in a pretty sano package. A bit pricey but I am happy with mine.
yes it is too pricey for what you get. make one yourself out of a piece of aluminum (cut it/trim/deburr on bench grinder/paint as desired) & be sure to use heat sink paste between it & bottom metal plate on module