These inserts will fit inside the Empire Builder:

The Size 1 Horizontal Brain Cell has interior dimensions of approximately 15.4 × 10.3 × 1.2 inches (392 × 262 × 30 mm), exterior dimensions of approximately 16.1 × 12.4 × 2.3 inches (409 × 314 × 58 mm), and fits these computers:

The Size 4 Horizontal Brain Cell has interior dimensions of approximately 13.3 × 9.5 × 1.2 inches (338 × 241 × 30 mm), exterior dimensions of approximately 13.8 × 11.7 × 2.3 inches (350 × 298 × 58 mm), and fits these computers:

The Size 4Z Horizontal Brain Cell has interior dimensions of approximately 14.3 × 9.8 × 0.9 inches (364 × 249 × 24 mm), exterior dimensions of approximately 15.0 × 12.1 × 2.3 inches (380 × 307 × 58 mm), and fits these computers:

The Size 5 Horizontal Brain Cell has interior dimensions of approximately 11.3 × 9.3 × 1.4 inches (286 × 236 × 35 mm), exterior dimensions of approximately 11.9 × 11.6 × 2.5 inches (302 × 294 × 63 mm), and fits these computers:

The Size 6T Horizontal Brain Cell has interior dimensions of approximately 12.4 × 10.0 × 1.3 inches (315 × 254 × 33 mm), exterior dimensions of approximately 13.0 × 12.3 × 2.4 inches (331 × 312 × 61 mm), and fits these computers:

The Size 6X Horizontal Brain Cell has interior dimensions of approximately 12.9 × 9.0 × 0.8 inches (327 × 228 × 19 mm), exterior dimensions of approximately 13.5 × 11.3 × 1.9 inches (343 × 286 × 47 mm), and fits these computers: