Hi, I have purchased the scum and villainy conversion kit, when building my list on the squad builder there are no "Thermal Detonator" bombs/devices.

Have they been removed from 2.0? There's no mention of them in the rules reference. What would be a good alternative device?

The problem I have now is the 1.0 Quadjumpers only had Thermal Detonator tokens in the packs, and the scum and villainy conversion kit didn't seem to come with any device tokens. Hopefully, I can get some second hand.

Yes they are not in second edition.

Unfortunately if you had no other bombs then you had nothing to convert. Not sure what device cards came in the scum kit but you need to tokens from first edition to use them.

Many bomb tokens have identical shape. Check them