英语翻译all the items ordered are in stock except Pattern No.900

英语翻译
all the items ordered are in stock except Pattern No.9001 Shanghai Printed Pure Silk.Stocks of these have been sold out since we quoted for them and the makers inform us that it will be another four weeks before they can send replacement.
as you stated in your order that delivery of all items is a matter of urgency,we have substituted Hangzhou Printed Pure Silk,identical in design and quality with those ordered.
they are rich-looking and most attractive and very popular with our other customer.we hope you will like them,but if not,please return them at our expense.
all items ordered are being sent to you today by air and should reach you tomorrow or the day following,we hope you will be pleased with them.
your faithfully
以上是一段寄送替代品的外贸信函,求助把这段文字翻译成中文外贸信函