This is the correct receiver for cars that works with the Futaba FASST system.
http://www.giantcod.co.uk/frsky-tfr4...-p-406589.html
Works fine in my 12th car, which are renowned for being really picky with radio gear due to the precisions required to control the car, the proximity of all the electrics and motor giving rise to plenty of interference opportunities, and the lack of protection if you hit something! I run one aerial along the chassis and one up the mast - not sure why but since the original Futaba FASST receivers have two aerials at 90 deg to each other, I just copied it!
I have no experience of using the FRSky Tx module. DCM, I replaced a Spektrum system with Futaba FASST and it is night and day. With the Futaba system I have absolute control, can run HRS and can at last adjust the car mid-corner and have it respond. (Note that a '12th' corner is over in much less than one second!) I would never use anything other than Futaba or Sanwa 2.4 as they are by far the most popular in 12th. I have always preferred Futaba Txs, so the 3VC was a no-brainer. However, the Spektrum system I had in it didn't work out for me, couldn't shake off the interference.
The safe option here is to get a Futaba 2.4Ghz FASST Tx module and then use the above receiver. That way I can assure you it will all work, and you will be pleased (V.pleased!!) with the results. I cannot vouch for the FRSky Tx module as I have no experience of it. Also note that to run this system with HRS, servos must be digital. HTH
