This vstack adapter is for the following chainsaws:
Dolmar:
6400,7300,7310,7900,7910
Makita:
6421,7300,7301,7900,7901
This vstack adapter will use any 2" ID filter of your choice. If you want to run an under the cover filter, I recommend my RBS 2" ID foam filter.
NOTE: You will need to modify the stock components if you wish to run this under the HD filter cover. This WILL NOT fit under the low top filter cover.
You can also run this without the filter cover