Looking for old-fashioned metal gate latch with vertical tension rod that slips into a horseshoe

bracket on the gate post. Something my clever dogs can't open. I actually have one such device on the back gate but need another for the front. Not asking anyone to do my research for me - I've been at that for hours! - but maybe someone will already know where one's to be found and will give me a clue. Just a little hint. Anything, a crumb even...

One of the major indulgences I awarded myself when I first bought this 100-yr-old fixer was the type of wire 'rainbow' or scallop top wire fencing popular when it was first built. Had to find the one company left that still made the stuff, then it was on special order when they had enough demand to justify it; now they don't make it anymore. I could put some kind of modern looking gadget on there but it would look horrible. I'm not persnicketty about much, at least according to my own perception! but I am about period compatibility in design. I once saw a picture of a renovated Vic that had been made ultra modern inside, and it still hurts my eyes.