Translation of "Stl#3456" in Japanese

We would like to ask you to reduce the prices quoted for STL#3456 by 5%.

ＳＴＬ＃３４５６の見積価格を５％値引きしていただけませんか。

We would be prepared to grant you a special discount of 5% for the quantity of 10 sets of STL#3456.

私どもはＳＴＬ＃３４５６１０セットについて５％の特別値引きをさせていただく用意があります。

We can prepare to offer you a special discount of 5% for the STL#3456, on condition that you place an order for more than 15 at one time.

一度に１５以上ご注文いただけるという条件で、ＳＴＬ＃３４５６の特別値引きをいたします。