Iv just bought a second hand td05 turbo but how can you tell if it's a 16,18 or 20g turbo and also the receipt from when the previous owner bought it said that it's a hybrid so what are the differences thanks 

hybrid means its parts from different turbos, really need to measure the housings to find out

A Hybrid turbo is quite a wide term for turbos that are non standard in spec . It can be fitted with different size exhaust or intake wheels , billet ally light weight wheels or even different sized compressor /exhaust housings.

To make them either spool earlier or make more top end boost than a standard unit of the same model .

It's very difficult to know what's been done just by looking, so your best bet to know the exact spec would be to contact the company that did the rebuild. giving them a any part numbers or info off the receipt or turbo .

If it's not broke .....upgrade it 😊

It doesn't say much on the receipt but I need to find something out because the shaft moves way to much and it needs a rebuild but this is the receipt 

Anthony is your next port of call methinks

That's what I was thinking lol