I have received the second prototype of latch for the card reader. The first had not exactly the right dimensions. This second, while OK in the dimension side, does not provide enough spring action to have the latch "lock" in place. We need to angle more the leg (just like the original) so that it provides enough torque so that it latches into the calculator.
On the aspect side, it is good enoug. It will be sold always in pairs, so that no one will be able to see the difference between an original one and ours. Please email to firstname.lastname@example.org if you are interested on the product!