If you have an industrial sheet metal shop or fab shop in your area, they probably sell small pieces of 18 gage sheet that you could use for these parts you need to make.
By the way, 19 gage steel thickness is 1 millimeter. American suppliers typically use 18 or 20 gage. 19 gage is probably more common in parts coming from other countries that are on the metric standard.
Mar-Ktech
