Aren’t all Remington rifle sight dovetails the same? you’ll need the correct height based on your barrel length. Any knowledge dealer should be able to help you. Trijicon makes em might be others, fibre optics are good and you don’t have to worry about fading/getting dull. Call Casey @ TAC ORD.
It’s dovetail there will be different heights based on barrel length. You might need to mic/measure the front sight anything labeled as Remington front rifle sight should work. Look at prophet river, wolverine, even gravel might still have stock. Their are glue and pin on front tritium sights for the 870 (Wilson scattergun) is one. I’m assuming you have the normal rifle rear sight on your barrel? Post a pick of your rear if you have one. Theirs a low profile rear sight but it’s uncommon.
Maybe this helps ....
If this is an 18" barrel .... then the Remington part number is (or was) F401820.
F401820 FRONT SIGHT XS TRITIUM DOT HEIGHT .350
The height of that sight should be .350
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