This has been bugging me for some time. The loco has been running a triang princess one with current spec standard 4 4-6-0 wheels. Main issue is those LMS footsteps. Also there was no representation of the sliding plate between the wheels. 

I had a spare 9F front bogie left over from a previous project and of course a couple of the GBL rears from the donor 4MTs. So here's the bits. 

After a quick go with the hacksaw

And I am glad I now have a milling slide for my lathe, made short work of machining the triang frame to accept the new parts

Parts loctited together and after a quick coat of satin black I'm happy 

Here's it in place