I recommend that you perform any measurements with a digital calipers; I'm fairly sure that this might be the reason for the discrepancy in measurements. Brake mounting flanges are a standard size and if you've got Dexter self-adjusting brakes on your trailer those would use a standard 4 bolt mounting flange like the ones found on the Dexter Nev-R-Adjust # 23-468-469 (both driver and passenger side assemblies). I've also linked a photo that shows the standard dimensions of a 4-bolt brake... view full answer...
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