Losi collars will not fit, but Trinity do a set for the B4/B44 aswell. They are pretty much identical to the Associated ones except they are a different colour.
I think Trishbits also has them in stock for the B4.
As Matt says you could deform the threads a little to tighten them up, though I believe that your collars will be metal so you may damage the threads on the shock if you did this.
Doubling up on the collars is an option for the front but you may not have enough room to get 2 collars on the back shocks, if you did your ride height would be very high.
In my opinion your best bet is to get some new rubber rings and put them in your existing collars ;-)
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