Sweed,
I chose a different lock on mine as I already had the Chambers Late Ketland on my .45 Gillespie, built from a blank by a feller from Virginia. I just wanted to try something different but available in the era.
If you use one Dennis' socks which I recommend, It's made for the Chambers Late Ketland and similar.
Here is the lock I chose.
Here it is mocked up on the stock...
Here is the lock plate with a little work.
With the tail filed an reshaped, that Davis is going to do just fine.
I almost used their 1803 as I have seen Southern rifles with military locks, but I decided on the contract lock that's a sister to the 1803 in style. I'm using the goose neck model instead of the double throat. This lock is based on American made locks of the 1790s-1800 era.
Do I recommend you do this? No, not really unless you want to. I just wanted to show that you can modify other style locks from the era.
On mine I'm using a combination of iron and brass, a iron guard and side inlay with brass pipes.
I have a cherry stock, so far it has worked well, I need to get back to it.