the bird built el tigres used the flat across bars, I have seen them with 2 different headtube designs but I think the spacing might be about the same.
The forkplate is on the outside not inset, the way the lower fender mount was designed seemed to vary.
Roper/sears bikes usually used the ape hanger style bars on their forks. The El tigre style are ALOT more comfortable for an adult rider, I preferred the ride of the el tigre over the sears bikes I have had. All the eltigres were also suspension forks, some of the roper bikes were not.