The only thing that it does not have is either a front one way or centre one way. I have read a few threads and am still not sure which parts I need as the 501x and 501x we appear different
Is this correct

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Hi Niall, if you are a beginner I would learn to drive the car without either a front one way or a centre one way as they increase steering response and make the car turn in quicker and it is something you need to master and remember it will only brake on the rear, if you are quite experienced then maybe the front one way would be the one to use, if you decide to use a front one way you will need the 36t one way pulley for a non we or a 37t one way pulley for the we, you can use a one way with overdrive I.E 35t one way pulley on non we and 36t pulley on a we but it's a bit 'snatchy' in the corners, you will of course need the front one way unit as well and an adaptor plate for the 36t or 37t one way pulley, parts below:
one way unit:
http://cgi.ebay.co.uk/OP951-Tamiya-T...item518c048577
adaptor plate:
http://cgi.ebay.co.uk/OP1006-Tamiya-...item3c9ab3f415
37t one way pulley:
http://cgi.ebay.co.uk/TAMIYA-54023-D...item3a52a945dd
36t one way pulley:
http://cgi.ebay.co.uk/Tamiya-53867-T...item518a401a6d
you could also use just a centre one way(I think it comes complete but I think you need to be using the we belts and pulleys) with your diff or you can also overdrive the ball diff, but I prefer the front one way myself