there is no magic size needle(gauge, yes) to match any compound. Needle size should be in relation to your body part. Glutes 1.5 inch, Quads, 1 inch, Delts 5/8inch. Most oil based products run fine through 23 to 25. Microionized compunds can go thru smaller gauges and even slin pins. Your source should be able to answer your question best in regards to how small of a gauge you can go for said product.
Sustanon should be fine through a 25G.
DLine