Everyone says there are loads of replacements - but I've never found anyone selling them.
Persoanlly I think the Draper banjo is naff - if you allow the tool rest to drop to it's lowest height it sits on the cam that locks the banjo making it difficult to tighten. But forget the DTL. I'm just trying to find somewhere that sells after markets ones.
Right with you now yes the banjo on that range of Chinese lathes is crap I had the same problem on the Axminster version and it is a pain. As mentioned in a post above the size of each banjo is specific to a particular lathe or range of lathes so no there isn’t a banjos R US store as far as I know.
There is a workaround that I used which is to buy a second tool rest and cut a bit of the bottom of it so that I could have it low and still move the banjo without having to lock and unlock the tool rest. I did cut the original one to a shorter length but then it wouldn’t let me raise the tool rest when I wanted it high, hence the second tool rest.
The second option is to take your banjo into a supplier, an Axminster shop would be best, and try it against the new range of lathes they have to see if one will fit.
Hope this helps and I like the items you posted.
john