OK, I finally got it working and will list what was required here for anyone who cares.
My LandPride grapple (SGC05) uses ORB connections whereas everything I've seen on my
BX25 uses 1/4" NPT. So what I needed aside from the snow blade was:
1. 4 ORB to NPT adapters. The ORB size is #6 (or 9/16") and I went to 1/4" NPT. I ordered 4 of these so I could replace the 2 nipples coming from the 3rd function valve and the other 2 are to convert the grapple connections from ORB to NPT.
2. 2 1/4" male NPT nipples. These replace the ones that came with the LandPride. I decided I wanted to make all my couplers the same and I am going with NPT just since that's what the tractor seems to use.
3. 4 1/4" female NPT couplers. 2 of these are for the snow blade and 2 replace the ones on the grapple. Same reasoning as above.
4. 2 3/8" to 1/4" NPT adapters. This is because the hose that came with the snow blade uses a 3/8" NPT connection and I needed to convert it down to the 1/4" couplers I am using.
You don't have to do all of that. I just decided to replace the ORB with NPT for uniformity and that's what I needed. I'm sure it's possible that LandPride could switch to a different style or maybe if you get it dealer installed they may use something else too. This was me doing all the work so I had to make some decisions on how to convert from NPT to ORB.
It would have been cheaper to convert the snow blade hoses to ORB using an adapter and then just buy 2 more of the couplers that the grapple uses, but the Parker Store in my area couldn't get them for 1 week as they aren't very common for them. I went with what I could get quickly as I'm tired of waiting for this project to be working.
Good news is, I tried it out and it is awesome. I can't wait for the next snow so I can clear the drive and compare times (I had been using the bucket before).