While the item you linked to here: DG Liquid Fan - Optics - Novalasers Inc. wasn't made to fit directly onto the DIY lasers focusing ring.
It should work with all lasers, it just may not fit as perfectly as it would on a nova lasers X, or alpha-series laser.
Re: 1-1.2 watt 445nm lasers **OUT TILL FEB-5TH** CHEAP $180
Uhm ..... those sellers have the items, but for outside USA buyers, they are not good ..... as example:
Optotronics: good 1000lines/mm (if true) product, but sincerely, asking like 29$ as shipping fees for send a 4$ item via standard USPS mail, does not look too much honest .....
Dragonlaser: their reflection grating can be good (if only they gives the lines/mm detail, that is the only interesting data, and that they don't say you), but they don't give you shipping fees for international until you have ended to buy something (very stupid thing to do, imho) ..... this also valid for amazon, that for this reason is NOT a trusted site, here.
onlinesciencemall: cheap product (500 lines/mm plastic grating) ad the right price, but still ask over 20$ for send few grams oversea with standard mail .....
Stonetek: Greg is a good seller. but this is the same product of onlinesciencemall, at higher price (but probably for buy one piece, total price is better, due to lower shipping fees) ..... but if they had those 25400 lines/inch frames with that price, instead, they will be much better, for spectroscopy use
Modwerx: apparently they only have "star" grating, not linear diffractors ..... ah, well .....
You know, here is damn difficult to get good optics