It is a common problem as there is a lot of people out there trying to get a hold of them and Associated has them on order. The B4 shaft will fit but you will need to ensure that it is limited to the same downstroke as the B44 shafts as there is a difference in length.
Any car that has the shock shafts as exposed as they are on the B44 is vunerable to breakages. I used to have a 501X and always had at least a couple of pairs of front shock shafts in the parts box as they are exposed as well. With the speeds that we are getting out of brushless gear and current batteries anything will break when hitting something and parts are exposed.
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