Reddit reviews APEC Feed Water Adapter For 1/2" and 3/8" Pipes use with Reverse Osmosis Water Filter System (SADDLE-FEED-1238)
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APEC Water Systems feed water adapter used with reverse osmosis (ro) systemsFits standard 1/2 inch or 3/8 inch faucet pipesIncludes a 1/4 inch outlet needle valve to feed water to ro systems or water filter systemsManufactured using certified materials
This was what came with my RO filter. It worked like a charm on the 3/8" stop valve under the kitchen sink vs plumbing in a new stop for the filter.
A supply house may also have what you want. Forget Home Cheapot, they're pretty worthless these days for parts. Also FYI, if you happen to need 1/4" push connect fittings for the RO system stick with the John Guest brand. I tried Watts and whatever other brands the box stores carried and they fit loosely and leaked. This seemed to be the consensus when googling too.