Our company is specialized in manufacture brake automatic or manual slack adjuster.It can used on lorry,trailer,and big bus. the MIDLAND NO as follows: KN44041 KN44051 KN44061 KN44071 KN47011 KN47001 KN48001 KN48031 FM02-19 and so on, if you need it,pls contact me,thank you. Peter Chen Tel:086-575-8736611 Fax:086-575-8736687