Originally posted by Aries326
<SNIPPED> I don't want to rush this project and end up ruining the car...
I don't think you can ruin too much (touch wood:-) I imagine the most damaging thing you could do with the transmission is have it bind somewhere which would heat up the motor and ESC, which could lead to some electronics damage.
But if you can't get the thrust bolt to meet the retaining bolt, then I guess binding is the least of your worries :-(
Don't know how you are for hobby shops, but if I were you I would consider simply buying another HD diff kit. Compare the bolts and if your original bolt is not right, contact AE and get a freebie. I have done this with a T4 kit which included the wrong idler gear shaft, and my experience was that AE were super responsive and I had a gratis replacement part in no time flat.
If you have a helpful LHS, then take your bolt in there and compare it with a HD DIff Kit bolt ...