Hello @Ulrich F,

Welcome to the Dell Community!

I suggest you to check directly with one of our partners. This way you will be able not only to find the required part number but also the price in case you want to buy it directly. You just need to select your country and find the one suits better for you: https://dell.to/2SlUWv3

I hope you find this information useful.

Regards.

Our Partner told us, that there is no Rack Mount for a T340 available but I can’t believe 

Hello Ulrich F.,

I did some checking, I'm sorry to say, that appears to be correct.  The T340 did not get a rack conversion kit but the T440 did.

I can provide you some documentation for comparison.

T340 Dimensions - Form factor: Tower server : https://dell.to/3yhQ75s

T440 Sizing- Form factor: Tower or rack, 5U : https://dell.to/2V1w7Wm

T440 Tower-to-Rack Conversion Kit from Dell : https://dell.to/3Aka1hU

There are Kits for T6x0 and T4x0 but i never saw a T3x0 one.

Regards,
Joerg

@Dell -Charles R :  I did some checking, I'm sorry to say, that appears to be correct.   The T340 did not get a rack conversion kit but the T440 did.

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Since the T340 & T440 have the exact same outside dimensions and seem to use the same chassis, would it be safe to assume that the T440 rack mount kit can be used on a T340 too, by any chance?

Thanks in advance for the clarification!

T440 and T640 can be inter used in that context, not for T340. 

PowerEdge T340 does not support rail kit. As rail kit is not supported we can not confirm that whether PowerEdge T440 rail kit works for PowerEdge T340. There is a very high chance that PowerEdge T340 will not have required pins to mount rail kits.