if you can, clean the label with wd40. it removes the tar and grime without damaging the printing. just dont rub too hard. the left rear jack is the same part. compare the front and rear, manufacturers sometimes use the same jacks front and rear.
if thats not possible, use the parts manual and compare the measurements of your jack to the parts manual pictures.shaft size and distance extended will help in identification.
take a pic and email it to Welcome to HWH Corporation
. they can sometimes identify it for you. yes they are slow responding, because they are overwhelmed with so many retail customers fixing their own coaches, but they will get back to you.