You can count on the Biketronics' kit if you want simple plug and play, very good quality, customer support and outstanding warranty. Whether or not the extra $ is worth it is hard for anyone to tell you.
As for the individual parts and pieces you listed;
For a two speaker setup you would want the Cerwin Vega B52. Not the B51. The B52 is 2-channel amp, the B51 is a 1-channel mono amp (sub-woofer application).
AMP trays clean up the installation a bit, but aren't completely necessary. For example, the Cerwin Vega B52/B54 and Diamond Audio Micro4v2 will all fit above the headlight assembly on all Rushmore Road Glides.
As for the BT355, there are 3 versions because there are 3 variations of the same line out converter. When you order, you order either;
BT355 Universal - no pre-wired speaker plugs so it requires splice and solder.
BT355 Front fairing only - it already has two plugs that attach to the existing OEM harness, so there isn't any cutting, splicing or soldering required.
BT355 Breakout harness - four speaker setup
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Last edited by wevsspot; 02-19-2019 at 10:20 AM.