The grills on the front (4 in total) can be purchased from Pilgrim, but I found it cheaper to purchase the mesh and cut my own from B&Q. Also you can choose the size of mess to allow more air flow into the radiator. I fixed the bottom grill with tiger sealant as it won't ever need to come out again. The middle and 2 side grills were fit with small flathead M4 nuts and bolts so they can be removed. While building I frequently needed access through all 3 of the whole, so good to make the removable.