Radiator Cowls (and Grills) that are interchangeable

[timberstone]

Can anyone tell which radiator cowls fit on which models?

Specifically, found a good deal on a TD radiator cowl that looks better than my TC radiator cowl, but am not able to measure the dimensions while it is already mounted.
Need it to not just fit, but also work with the openings and grill slats .

Think there is some difference in the crank holes, but are overall size differences too much to adapt from one T series model to another?
Octagonally yours,
BOXLEY (Robert and MGTC0820)