the brackets for the 3000 will be useless on the 800 series.
also.. the laoder for a 3000 has a short 3.5" connection box.. the 800 needs a 5.5" connection box for happiness.. with the following exceptions.
there is a reare offset bracket for the 00 series that lets a 3.5" box set correctly.. they are so rare.. you will find it eaier to turn lead into gold. or.. you can mount hte loader canted at a slight angle.. it's a tight fit.. but I've done it 2 times on working tractors.. still use both of them. laoder bucket just angles a lil bit in front of tractor.
that said.. you need the brackets for an 00 sereis. they are getting harder and harder to find every day.
you might be able to swap your 3000 brackets for some 00 brackets.
ps.. where'd you get a 5spd 3000

should be 4, 6, 8 or 10

and or a weire reverser with a couple combinations.
also.. pump location makes no difference... the hyd 3x5 connection port is under the right side of the seat on all of them..

same valve fits an 00 as a 3000
i got probably 8 of those 1-arm laoder if not more in parts usually at any one time..
soundguy