Is ENGINEER SS-17 also compatible with SS-03?
Yes. ENGINEER's official Japanese page explicitly lists SS-17 for both SS-02 and SS-03 solder suckers.
What are the correct tube diameters?
The outside diameter is 3 mm and the inside diameter is 1.5 mm.
Must the tubes be used at their full length?
No. The tubing can be cut to the required length and used as a nozzle.