just bought a j tec inverted pitts muffler for use on a da50r.along with the muffler came to extra pieces of metal stock.first one is rectangular and has a square cut out for exhaust port.this may just be to space the exhaust out?the secound piece is smaller rectangular with just to small bolt holes one at each end.the corner of the stock is cut off.this from what i have googled may be for braces but cant find a way to attach it.any help or pic would be great on there pupose