I would probably avoid using that rusty filter because it may be that rough on the inside. This thread caught my eye because it is a hydraulic filter for a Kubota tractor. I ran into an issue with the hydraulic filters coming loose and leaking on my New Holland TZ25DA sub compact. Those leaks were really getting annoying and I figured I’d try OEM. So, I took a ride to my New Holland dealer who is also a Kubota dealer. He set me up with the OEM filters and I asked if he heard about non-OEM filters leaking and answered that it’s a very common problem, especially with Kubota machines. The OEM filters were very close to the price of the NAPA filters I bought so other than the 60 miles trip isn’t really worth the difference in price. Stick with OEM filters on your tractor!