Flat motor

I have an electric motor like this:
Size: 24 x 10 x 12 mm
Weight: 0:34 oz
Shaft diameter: 3 mm
Gear ratio: 298: 1
Free-run speed 6V @ 100 rpm
Free-run @ 6V current: 70 mA
@ 6V Stall Current: 1600 mA
Stall torque @ 6V: 70 oz · in

driven by a L298N like this

as have changed the terms of use I would like to replace it with an engine with more rpm (if possible) but especially the distance between the beginning of the shaft and “plan” must be maximum 10 mm x 25mm.

Do you know something that makes my case?

Thank you

G.W.H.

There are many variants of that style of gear motor - checkout micrometal motors on eBay. I've seen many gear ratios and different shaft lengths.