Are you sure Ken, I thought they would get OH&S involved. Seeing it is involving a flammable substance. Create a SOP(standard operating procedure ), a SWMS (Safe work method statement ), cordon the area off, then proceed with the repair, get halfway through and realize they didn't have the correct filter, order the correct one. ....Two weeks later install it. After the 3rd week you phone them angrily wanting to know when the hell your bike will be ready. They reply with "We did try to call you but we must have had the wrong number " You go to pay and it costs a lot more than verbally mentioned as there were complications. .....Next time you get one yourself and install it.