RE: does anyone know who makes this strut?
pretty much,
Page 9 of their catalogue... looks very much like the following items (depend on the size):
CAR/15175/000 wheel dia. 50/60 mm
CAR/15176/000 wheel dia. 65/70 mm
CAR/15177/000 wheel dia. 75/100 mm
From the link above, choose download at the bottom of the page, then landing gears.