Hi m_c

Are you looking for a replacement for an existing control or are you building your own control panel ?

if you go to RS Components for example
http://uk.rs-online.com/web/c/passiv...potentiometers

use the filters on the left hand side of the page

select
the maximum resistance
the number of turns - one or multi turn
type - linear
mounting type - bush mount
shaft diameter - 1/4" or 6mm
element type - Cermet or wire wound

etc
by the time you have selected
the options you require
you will of reduce the 1500 potentiometrs down to half a dozen at most

as an example if your looking for a single turn linear 5K potentiometer
is this what your looking for ?
http://uk.rs-online.com/web/p/potentiometers/8509514/

for alternative UK suppliers
try Rapidonline.com or uk.farnell.com


John