Solid aluminum base. Sits flat on workbench. Steel preload pin. Steel threaded studs. This sets the preload to 14MM. I have 1MM shims I can send you in order to set the preload to 13MM. 14MM was used on the early dome top pumps. 13MM was used on the square top pump.

Left Side

Made in 1970's in Brazil

Vanagon

Marked with an 88 on the outside of the tool as noted in picture.