Thinkpad A20, A21, A22 & T20, T21, T22 Options
basically, all options for either will work in the other except, obviously, the various bateries.
Note: The A20m series batteries are 3.6 AH while the A20p batteries are 5.4 AH.

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IBM #

Description

20L0254

64MB SDRAM Memory

20L0255

128MB SDRAM Memory

33L3069

256MB SDRAM Memory

02K6649

T Series Li-Ion Battery

02K6640

A Series Li-Ion Battery

02K6646

Li-Ion Battery for Ultrabay 2000

02K6643

External Battery Charger

02K6699

72W AC Adapter

02K8667

Port Replicator

263110U

Thinkpad Dock

00N8222

Monitor Stand

33L3243

USB Mobile Mouse

33L3247

USB Scrollpoint Pro Mouse-Slate Blue

33L3225

USB Numeric Keypad

33L3174

USB RapidAccess II Keyboard Stealth Black (or PS/2)

28L3621

Preferred Keyboard (PS/2 Only)

27L0524

T Series FDD Cable Kit

05K9233

24X-10X CD-ROM Ultrabay 2000 Drive

33L5151

USB 24X-10X CD-ROM Drive

05K9232

6X-2X DVD Ultrabay 2000 Drive

05K9236

Superdisk (LS-120) Ultrabay 2000 Drive

00K8252

4X/4X/20X CD-RW Ultrabay 2000 Drive

05K9237

6GB HDD

05K9238

12GB HDD

05K9239

18GB HDD

08K6068

Second HDD Adapter for Ultrabay 2000

19K4480

USB Portable Drive Bay 2000 (PC Card)

00N8073

340MB MicroDrive Kit

08N1032

Ultraport Camera

34L5301

10/100 Etherjet CardBus Ready Port Adapter

34L1301

10/100 Etherjet CardBus Ready Port w/ 56K Modem

34L4801

16/4 Token Ring CardBus Adapter

09N9863

PC Card Wireless

9085NA2

Access Point Wireless

09N9774

10/100 Ethernet Mini PCI Adapter w/ 56K 3Com

08K3214

10/100 Ethernet Mini PCI Adapter w/ 56K Modem

33L5075

SmartCard Security Kit

08K6064

Asset ID RF Adapter

00N8215

USB Multiport Hub

9511AG1

T54 15" TFT Display Steath Black (low cost)

9493AG1

T56 15" TFT Display Stealth Black-Pivot/Rotate

9497AG1

T86 18" TFT Display Stealth Black (High Res.)

651747N

E74 17" (15.9" viewable) Display Stealth Black