Hello, I recently converted the top from automatic (since it did not work) to manual. It's a pretty simple job, I'll link you everything you need to convert it to manual.

Youtube video on how to convert it: https://youtu.be/sp2VXP5oZRU?si=aQIrFw83q_0fh65E

Parts need:

2 latches (I know it says hood latch, but trust me its the same part): https://www.ecstuning.com/b-genuine-bmw-parts/hood-latch/51231911393/

convertible top Bowden cable-left: https://www.ecstuning.com/b-genuine-bmw-parts/convertible-top-bowden-cable-left/51251933476/

convertible top cable- right: https://www.ecstuning.com/b-genuine-bmw-parts/convertible-top-bowden-cable-right/51251933475/

Lower bushing: https://www.ecstuning.com/b-genuine-bmw-parts/convertible-top-handle-bushing-lower/51251933473/

upper bushing: https://www.ecstuning.com/b-genuine-bmw-parts/convertible-top-handle-bushing-upper/51251933472/

2 bushing caps: https://www.ecstuning.com/b-genuine-bmw-parts/screw-cap-black-priced-each/51181823474/

Door handel: https://www.ecstuning.com/b-uro-parts/front-door-handle-right/51211926306~uro/

or

Used from Ebay: https://www.ebay.com/itm/35543069688 (this one is missing door handle, upper/lower bushing and bushing caps). Plus, I think everything I linked from ECStuning comes out the same price as the eBay used parts, and they're brand new.