Printer Drivers for "Windows Server 2008 R2 x64" question

I am looking for Printer Drivers for "Windows Server 2008 R2 x64" but they either show up as following:

Windows Server 2008 R2
Windows Server 2008 x64 Edition

They do not show up as "Windows Server 2008 R2 x64".

Which driver should I install on the Server ?

It is critical the correct driver is installed for our ERP since users print using RDP.

S TAsked:
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I don't think you will find R@ drivers as the x64 edition should work.

Client OS is?  XP and/or W7? 32-bit 64-bit?

You will need identical version 32-bit drivers to match your x64-bit drivers if you have 32-bit clients.  For example:  Universal 32-bit PCL6 version 5.88 and 64-bit PCL6 version 5.88.
S TAuthor Commented:

Clients are all XP Pro SP3 32 bit.

Then you will definitely need to find drivers that are the exact same as the 64-bit you install on the server
S TAuthor Commented:

XP Pro 32 bit Clients use PCL 6 driver in our domain,

See screenshot.

In this scenario, I should save "Windows Server 2008 R2" driver. Then install the PCL 6 64bit driver in Server 2008 R2.

Correct ?
Install the printer using the Windows 2008 x64 first and then the Windows 2008 R2 as an additional driver.
to install, click on the printer and chose properties after the printer is set up.  click on the Sharing Tab and you should see Additional Drivers button at the bottom where youcan install the 32-bit Windows 2008 R2  drivers.  Like i said make sure they are both PCL6 and the same version.

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