Hi! You won’t find suitable wire on the A&L website… I’m just guessing that the usage is RDL .. and not DL .. if I absolutely had to choose from the A&L website for the DR Solo RTA, I would choose this..
https://www.aromes-et-liquides.fr/en/consumables/18318-fumytech-alien-rdl-ni80-25mm-coils-x10.html
After quickly watching some videos, a 2.5mm inner diameter is ideal for it.
If you decide to get into DIY coil building, look for some Tri-core fused clapton wire with parameters like this:
Sweet Vapes 