I emailed them and asked if they had a unit that would fit my 4720 with a 72” 7 iron deck. The answer was it would but they didn’t offer a deck boot that would work. They suggested I could find one online. The only boot I could find was a metal one that uses an 8” hose. I was hoping terra king would supply one. I would think everything except the boot would almost be a one size fits all.
I also have a 4720 with a 72D for it, and can tell you aTKV20 might not clear the rear tires. While I haven't put it on it I've looked at it, and even with the 3PT swung all the way right, there are going to be hose/tire issues. Remember my R4's in narrow were 72 wide, now with 2" spacers it's at 76", which is why I use 78" buckets, and larger implements.
A 72D fills the TKV20 real quick. Now the new Frontier MC2120 fan clearly sticks out farther, and the angle on the blower is changed, and plastic.
As for the boot for the older 72D for the 4 series, and the even older 72 for say a 955. Get the boot offered by TerraKing and mod it. There is nothing better out there for a boot for a 72 inch deck. TRUST ME, I've been trying and modifying 72" boots for about 20 yrs, basically come up with the same design as TerraKing just steel, and poly lined.
JD once offered a plastic, and steel boot for a 72, and stopped for the same reasons I starting my mods, The 72 throws so much grass at the boot anything Deere sold couldn't handle it. But that was with a 7" hose, and smaller under powered blower.
I still have a high dump MCS and 2 steel boots for 72' decks. They are trac vacs. Not cheep. I paid 268.00 10 yrs ago. I even have a 60" boot from TK.
I can't even guess what Deere will charge for that MC2021 with the FS2, all lights, wheel kit, and boot. With the lights, quick electric disconnect, JD stickers, wheel kit, 2 boots, 72D, and 60D, I'm all in around 4G's minus my time. Huge amount to be able to bag, but when you need it you need it, and there is NOTHING that works better. It's only missing the ability to high dump. High dump would add 2-3g's easy and there is nothing out there in a US market anyway. Even the TKV20 is too small for the 72D's, which is 1 reason i've kept my origional high dump MCS. I've been designing for the last 12 yrs to make a pto driven high dump MCS for my 4720 and 72D.
My suggestion to you is now that the Frontier MC2021 is out is that is the way to go, and get the boot for the 72D. Mod the deck to accept the boot. Only boot that truley works on the 72D, others SAY they will. Not like the TerraKing. They all WILL plug, the terraking, seldem if ever will, UNLESS you do like I do and TRY to make it plug, part of my deal with TerraKing. I wish they came out years ago. I don't want to admit how much time i've spent working on boot, hose, deck, and blower mods over the last 20 yrs.
Allen.