Tom Hall makes a T5 conversion kit that is complete, and can also supply the proper T5 transmission to go with it. All-in cost is about $4000, for a brand-new transmission, shifter, and drive shaft. I don’t recall if a clutch release bearing is included.
There are many different T5 configurations, and for a Tiger you want one of the "world class" versions, that can handle the torque output of the engine, as well as having ratios suitable for the Tiger. Many of the smaller-engine variants of the T5 have very high ratio first gear (even the Mustang trans comes with a 3.35 first) and these are completely unsuitable.
The different T5’s also can have different input shaft lengths and clutch spline size, so you want to be careful about that part as well.
So… it is possible to build a T5 from various parts that will sort-of work, with a lot of effort, and it requires sourcing parts from at least two different vehicles. Best source for the main body of the transmission and bellhousing is an ’87 to ’93 V8 Mustang; you still have to make sure you’re getting the World Class variant. The AMC tailshaft is very difficult to obtain these days. There is an alternative in using the GMC S-10 tailshaft assembly, but this leaves the speedo drive in an unfavorable position and apparently some parts of the speedo drive will need to be reworked to prevent leaks.
If you want a T5 that you can bolt in, talk to Tom. You have to figure out if it’s worth spending a lot of hours to reinvent the wheel…