How to paraphrase this sentence?

Hi,

Please consider this sentence:

“Thank you very much for your offer dated 5 March for your rush mats”

Could you help paraphrase this sentence to make it more natural and… better? Somehow I feel it’s not good to use the word ‘for’ twice, but I’m not sure how to make it better. What about this?

“Thank you very much for your letter/email dated 5 March in which you offer your rush mats”

Thank you very much for your offer of rush mats, dated 5 March.

Hi Beeesneees,

Is the comma really necessary there?

Unless you want people to think the rush mats are dated rather than the offer!