Custom speaker adapter ring with two bolt circles

Does the replacement speaker fit the opening but miss the existing fixings or required spacing? This ring connects two equally spaced bolt patterns. Recessed flat seats provide access to base screws, while separate blind pilot holes accept suitable speaker screws. What you can customise: Match the opening and height to the actual basket. Set both hole counts, circle diameters and relative angle. Keep base screw heads below the speaker mounting face. How to measure: 1. Measure the basket, opening and clearances in front of and behind the speaker. 2. Determine both circle diameters and hole counts. For four holes, measure between opposite centres. 3. Check spacer height and screw heads. Set the relative angle to keep holes separated. Assembly and trial fitting: 1. Trial-fit the ring alone and check every hole position. 2. Attach to a sound base with suitable screws; flat seats are 4 mm above the underside. 3. Fit the speaker without bottoming screws in the blind holes. Add a separate gasket if needed. 3D printing notes: Print flat underside down. PETG is a starting point for indoor prototypes; assess heat separately. Start with 0.2 mm layers and at least four walls. Finish pilot holes and screw seats. Fit and included geometry: For flat bases and equally spaced circular patterns. No vehicle-specific approval or acoustic/sealing guarantee. Screws, speaker and gasket are not modelled. Vehicle installations require checks for heat, moisture, window travel and existing safety equipment.