Remington 20ga or 12ga Wingmaster Trigger plate assembly, gloss blued finish with Gold Trigger. Fits lightweight 20ga 870's all models including Express. If your 20 gauge serial number starts with the Letters RS of ends with the Letter "U" this fits your gun.
The 12ga fits all 12ga 870's regardless of Model. These retail on the Remington parts list for $95.09
These are cast aluminum Wingaster trigger plate assemblies.