1972 dart 360 with 904

Not the only option, but it's what I would call the better option. The other option is a 360 only weighted balancer and a stock flex plate. Thing is, both options cost about the same, so why not go with the better flex plate?
This is what I want and asked for bud states no One makes a weighted converter
That's because they aren't Mopar converters.
Well it's what is showing for a904 converter