Quite a few like this due to accident damage albeit each with their own subtle differences. From memory they were 006/19/65/75/100/102 which had marker lights at one end and boxes at the other. 006,19, 65 and 100 retained the nose doors but lost the boxes. 102 had a friday afternoon look about it with strange tail lights, cut back bufferbeam cowling (as did 19) and no doors. When converted to 712 they sorted most of the bits, but left the obscure tail light mountings.
Also with odd ends was 37072 which had a centre box and roof mounted horns at one end only. In addition 073/74/091 were rebuilt after smashes with centre boxes in the 60's and to the untrained eye are identical to a standard centre box series 2 machine. Laira also struggled with any 37 that wasn't centre box so rebuilt 031/047/053 into centre boxes but with nose moutned horns.