smaller receiver?

[wookiee76]

Hi guys, I'm currently running a spectrum dx2e radio and am finding that the receiver is a bit on the big side to fit into my 22-4, I know back in the days of 27mhz radios you could just get a smaller receiver from a different brand and it would work perfectly (still got a novak xxl that I used to run with ko radio) can you do the same with 2.4ghz radios and if so does anyone have any recommendations?
Currently the only place it will fit is on top of the transmission rather than beside the servo and then only just clears the shell.