at the rear of this Jonsbo MOD1 case, there is the hole that I circle in green, in which I plan to put a 5.25" blu-ray drive at the bottom, and a 5.25" fan controller at the top. The actual dimension of the hole is 6.5" x 2.2" The standard length x width of any 5.25" drive is 15 cm x approx. 5 cm What is a material that looks nice to cover the remaining of the gap, a gap of approx. 1.7 cm x 0.5 cm (I'll remove the plug at the bottom hole so both the top and bottom will have the same gap)