When introducing an older vehicle into the game I usually try and work outs context first. If it's a one off some group got going then anything goes, but if it's not then there has to be some considerations.
First off, some vehicles need essentially gutting and installing stuff from existing vehicles. This is made easier if the vehicle comes from a class of vehicles that are still in service such as the common-as-mud M113 chassis. Otherwise you're looking at installing new engines, transmissions and suspensions. Really, don't do this for tracked vehicles but you can get away with it for some wheeled vehicles.
If the vehicle is really old you can simply throw the turret (if there is one) away and drop in a new turret. Note this has to be a lighter turret. Most turrets have their dimensions available on the internet and such things as the BMP-1 turret or the Textron 1 metre turret will fit into a lot of things.
Next, weapon commonality. It doesn't need just compatible ammunition, you need enough spares. Really you want a standard NATO/WarPact (depending on who fields it weapon). Either you have to have enough to cannibalise or it has to be dead simple so division can fabricate new parts (such as for rocket tubes). A classic gun for NATO vehicles on the large scale is the L7 105mm gun because there's buckets of them around.
Generally thinks like a coax and pintle mounts will be swapped for the correct weapons unless you're making an all-OPFOR equipment force, something usually only done in emergencies. Likewise radios. Adaptors for things like periscopes can be made given time and inclination.
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