I would recommend these guys for all your carb needs.
Jets, needles, springs, gaskets etc etc........
They stock everything and usually its there the next day.
Always worked for me!!
2006 Scrambler, VARK'd, FCR39's & DNA's, 790 In-cam, Pieman'd igniter, Zard 2:1.
2005 Thruxton Black, with ARK, FCR 39's & Uni's, Retimed 790 cams, Barnett clutch and suchlike!!