[Elecraft] KX3 Questions

[Wolfgang, Larry, WR1B]

I guess I am getting ready to put a KX3 order together. Suggestions about roofing filter choices and other configuration suggestions welcome.
I have noticed that there is some information about a 2 m / 4 m transverter. I've trying to figure out what the 4 m band would be. I'm not aware that we have an allocation there (70 something MHz?) The information still seems a bit sketchy about that. Any ideas? Thanks.

73,

Larry Wolfgang, WR1B