The last remnant of the West Roman Empire was conquered in 486 when Clovis defeated Syagrius who had ruled over northern Gaul. That part of the Frankish kingdom would be called Neustria (the New Land) as opposed to Austrasia (the Eastern Land), which was the original core territory of the Franks.
Grab bar mounting brackets made specifically for fiberglass installation have discs that safely distribute the weight of a person and prevent the fiberglass from cracking. By attaching the brackets to wall studs with bolts, you ensure that the grab bar will not pull out from the tub or shower wall when in use.
Here's how to install 1x4 backing for mounting two towel bars. The process is the same for attaching other types of wall-mounted fixtures, with one notable exception: When installing a safety grab bar, replace the 1x4 with a 2x4 and secure it with countersunk lag screws.