So, this is something I want to do with my setup too, but I haven't looked into what size I would need yet. There is a UVB guide by Reptiles and Research, who advocates for UVB with snakes (I haven't gone into watching it, but this person has several videos regarding UVB and snakes). There's a segment on selecting the position of the bulb.
As for a basking lamp, I'm not sure you'd need a separate one in addition to the UVB? I could be wrong, though. I think they will exhibit basking behavior with the UVB lamp only, even if it isn't very hot.
If it were me, I would set it up without it and see what the temperature is. Then, add the UVB and take temps over a day or two and see what difference it makes--all before putting the snake in. I think you can make it work, but you might just have to tweak it a bit and see what kind of difference, if any, it makes temp-wise.
You may be able to tell from a few of his other videos if it's on the same side as the heat or not, or it may even be covered in the video I linked--again, sorry, I don't have the time at this moment to double check for you. I have actually emailed this Youtuber before with questions and he did respond right away, so maybe you could even ask him!
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