I recently upgraded my 2006 Gibson SG Worn brown, with a Bigsby B3.

I love my SG, and could not bring myself to drilling holes in the body.

Therefore i bought the Towner Retrofit Kit.

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The kit included a special aluminium washer, a screw, some rivets, some protective pads and an assembly to replace the tune o matic bridge string ancor

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The washer is placed between the strap button and the bigsby, to make a solid and secure contact between them.

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The screw replaces the old screw that held the strap button in place.

This screw is a bit longer to compensate for the bigsby and washer, and slightly fatter to secure the bigsby tightly to the body.

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The rivets are used to cover up the holes in the bigsby, that are intended for screws into the guitar body.

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The assembly makes an adjustable string holder, that holds the strings from

the bigsby at your set angle.

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I installed a Bigsby B3, as i think they look a lot more pretty than the B5.
The B7 does not fit properly on an SG, especially without any mods.

The B3 also opens up the opurtunety to install a bigsby with no pernament modifications.