should be the same.
I have had 2 poly 318's and used the same SB filter I used for any other, LA or otherwise, and they work fine.

Both a couple years newer, 65 and 66, but should be the same filter.

Till I knew better, I used the PH8 fram. But that or the short one , I think is 48, should work fine, or whatever that crosses to in Wix.