Trex 500 head compatibility?

[branflake12]

Hey guys,
I got a hit on my for sale on the G550 airframe, the user asked if a trex 500 headblock would fit. From my search here, i found that the T500 swash fits...

Any help?

[nexgen]

Based on shaft size, it would fit on there, but I think the grips are too small.