英语高手们,请进,帮忙

请问你们的工程师是否有帮我查找以下二个物料的替代品?Please let me know that have your engineers helped me find the substitutes for the following two materials?
以下为我们美国同事再次找到的替代型号,请立即确认是否可以使用?另外,我们需要在本月底拿到各50个样品,请确认是否可以.The following are the alternative types that our American colleagues seek out again,please confirm if they can be used or not?
In addition we need to get each 50 samples for every type in the end of this month, please confirm if it is possible.

I want to know whether your engineers look for the substitutes of the following two materials.The following types are what our American colleagues found,please confirm whether they can be used.In addition,we need to receive 50 samples at the end of this month,please also confirm whether it is possible.

Would you please inform whether your engineer have got the substitute for the following two materials for me?And pls make sure whether the substitute model our American colleages have refound could be used. We need 50 samples by the