If you only need a mount and not the cradle, here is what you need.

Fits many Aera, Nuvi, Dezl, and StreetPilot models including:

AERA: 500, 510, 550, 560

DEZL: 560LMT, 560LT

NUVI: 30, 40, 40LM, 50, 50LM, 200, 200W, 205, 205W, 250, 250W, 255, 255W, 260, 260W, 265T, 265WT, 275T, 370, 360, 350, 310, 300, 465T, 500, 550, 680, 670, 660, 650, 610, 600, 785T, 775T, 770, 765T, 760, 755T, 750, 885T, 880, 860, 855, 850, 1100, 1100LM, 1200, 1250, 1260T, 1300, 1300LM, 1350, 1350T, 1350LMT, 1370T, 1390T, 1390LMT,1450, 1450LM, 1450T, 1450LMT, 1490T, 1490LMT, 1690, 1695, 2200, 2250, 2250LT, 2300, 1300LM, 2350M 2350LMT, 2350LT, 2360LMT, 2360LT,  2370LT, 2450, 2450LM, 2450LMT, 2460LMT, 2460LT, 2555LT, 2555LMT, 2595LMT, 3450, 3450LM, 3490LMT, 3750, 3760T, 3760LMT, 3760T, 3790T, 3790LMT, 5000

Fits the following Zumo car cradles:  550, 500, 450, 400