Hydraulic filter has no makings - IS3000Z

I am not able to identify and or verify if my dealer is selling me the correct hydraulic/transmission oil filter for my new IS300Z . The manual calls for p/n: 5021357. I have done extensive on-line research and still not sure! The filter that came with the mower is all white ? no P/N, no marking (not customer friendly). The dealer has sold me both an all white filter (p/n: 5021357X1) and a Stens (p/n: 120-818). I cannot determine if the OEM filter that I should be using is a 10 Micron filter (or higher?) or if any by-pass valve is recommended and if so the valve setting. I believe the dealer is selling the wrong filter, and should be selling me a Stens 120-710. Has any one looked into this.