For those interested, the following filters appear to fit on the 350is. This list came from an earlier discussion on the Cruzer forum. Repeated here to take advantage of this great, new, UL Power Forum!

For the 350is

Oil filter
Napa 1334 oil filter
Saf-air 14X1.50 quick oil drain valve
K&N oil filter HP-1004
Wix better than Frame
Wix 51334
Bosch 331
Oriley 51334

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Thank you for posting. I am going install a WIX on my customer's UL 350iS, can't find the KS 146-OS.Wicks Aircraft is out of the OEM due to inventory mismanagement. 


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