Re: Holland Recoil Lug
The Holland recoil lug is slightly thicker (.250" or something like that) and it is tapered.
When putting it back in the stock, you will have to remove a little material forward towards the barrel channel. The aluminum is a bit of work to remove but you should be able to handle it ok with a Dremmel tool or something similiar.
If it's not far, it's boring.