Most of the beats can be modified for an additional fee. The way the beat is arranged when you play it from the website is how you would receive it (mixdown wav and mp3). Concerning bridges, sometimes the bridge is vague (a few dropped instruments) and other times it's completely flipped... It's all at the discretion of the producer. Note, any modification, no matter how small, will be cost at least as much as our Custom Production Level 1 pricing, due to the limited availability of our producers' time and the nature of our recordings. Prices are listed here - https://sfrbeats.com/pricing?q=Custom - adding a bridge would either be level 1 or level 2, and more for certain recordings recorded with many live musicians involved.
Another option is to purchase trackouts for the beat, and use the individual instrument tracks to create your own bridge (dropping out instruments works well in this scenario). This will give you the same "effect" for a lower cost.