[irvan36mm]

Jake- Lefthander's got em. $16.00

http://www.lefthander-rc.com/catalog/product_info.php?cPath=50&products_id=579

If the sintered one is illegal at your track,you shouldn't go wrong w/a direct replacement one. If you don't already have one,look into getting a motor cooler,either from Lefthander or Crazy Ronnie. It really helps out the motor from thermalling,thus saving the rotor.
-George

 

[irvan36mm]

You quoted the wrong part. That is the rotor for the original 4300 and 5800. The 13.5 has the larger front bearing and takes a different rotor.

Oops! Forgot the 13.5 had the larger bearing! No listings for the 13.5 rotor @ Lefthander.