Even the UK thought about it at a short period of time too, back when Maggie was our PM and luckily we kindly told them where to put it, in a polite manner of course. We even considered the German Leopard then too, but the design of the Leopards turret put us off buying it believing it was a poor design, saying that, that was when the Leopards turret was completly different to the one we see today. Then of course the Challenger 1 was chosen, had a few bits wrong with it but very quickly soon mended just in time for the Gulf War where it performed second to none. Then of course came along the Chally 2 we have today although a lot has been done to it recently.That is correct.US was working very hard to shove it up Pakistan's Army throat but thankfully we did not purchase them. (It would have caused severe problems to Strike Corps due to sanctions in 90's)
I'm a little surprised Pakistan didn't go for the Vickers Mark 3 MBT in the 80's, but of course I'm not quite up to date how the British & Pakistani governments got on in those days.