The last time I replaced mine, I used Anco. I don't know whether they fit better than Trico, but I don't recall any problems with the fit. As I recall, they supply a gazillion little plastic pieced for adapting to whatever you have.

FWIW

I just put new wiper refills on original arms (I don't know why, it never rains here) and found NAPA 18" refills.

They are NAPA 60-1898 $5.59 for 2 blades in the pack.

I had to close the tangs a little where the new blades slide thru the original arm retainers for them to fit securely.

I don't have a Napa close by.  Probably will buy from Amazon as other part stores won't stock blade inserts, they want to sell the whole blade.  Are the correct part numbers Anco U-18R or Trico 44-180?  I tried to harvest the blades from a Trico "Exact Fit" 18-1, but those are 6mm blades.

 

(Think this is a reference thread as it comes up high on google searches)

I buy Trico 44-180 refills from O'Reilly's.  Two blades per pack, $7.99 IIRC.