I found a clue looking at the parts compatibility for the fork sliders. As the mounting points are the same, caliper carry brackets should be theoretically interchangeable too. Therefore an upgrade for any of these bikes with this part should have similar outcomes:
(Note: Tapatalk discards some color info so highlights are best viewed dieectly in Hondatwins website)
51521-449-023 CASE, L. (LOWER)
[FRONT FORK SLIDER]
78 CB400A
78-79 CB400TII
80 CB400T
79-80 CM400A
79-80 CM400T
78-79 CX500
79-80 CX500C
79-80 CX500D
After checking our forum, thought it would be interesting to search for options for the CX and found this gem:
http://cx500forum.com/forum/technical-help-forum/15343-cx500-dual-pot-caliper-upgrade.html
Start excerpt:
So if all the info works what that means for us is if you have a 1978-80 cx500 [of any variety (and any of our bikes in the list above) and I believe the 1981 cx500 deluxe because it doesn't have leading axle forks but I cant be sure. Maybe someone can verify that. The the mounting bolt points on the forks will be 2.5 inches apart and take bracket part number 45110-445-632 is shared with
1981
CM400C
CB400T
CB750F
CB900F
1982
CM450A
CM450C
CB750F
CB900F
GL1100
1983
GL650
GL650I
1985
VT1100C
1986
CB450SC
CMX450C
VT1100C
(The 2.5" carry bracket will look like this):
[attachment=0:romnh8ii]image.jpg[/attachment:romnh8ii]
(This section is not relevant if upgrading bike from top/green list but might be useful to someone)
But if you have a 1981 cx500 custom with leading axle forks the mounting bolt points on the forks will be 4 inches apart and take bracket part number 45110-MA5-006 BRACKET, L. FR. is also used on these models and components:
1982
CB750C
CB900C
FT500
1983
CB550SC
CX650C
FT500
VT500C
VT500FT
1984
VF500C
VT500C
VT500FT
1985
VF500C
VT500C
1986
VT500C
(End excerpt)
So, if you want to upgrade a single piston (front left) caliper from a bike on the top list (green), you'll need the carry bracket and dual piston caliper from a bike on the second list (orange); or at least the carry bracket from second list (orange) and caliper 45101-MA3-006 from bike on this list (purple):
81 CB400T HAWK
82 CB650 (EARLY VINS)
82 CB750K
82 CB750C CUSTOM
82 CB900C CUSTOM
83 CB1000C CUSTOM
81 CM400C CUSTOM
82 CM450(A/C) (CUSTOM/HONDAMATIC)
82 CX500C (TC ) (TURBO)
81-82 CB750F SUPER SPORT
81-82 CB900F SUPER SPORT
83 CB1100F SUPER SPORT
81-82 GL500(I) SILVERWING (INTERSTATE)
83 GL650(I) SILVERWING (INTERSTATE)
82 GL1100(A/I) GOLDWING (ASPENCADE/INTERSTATE)
82-83 FT500 ASCOT
86 CB450SC NIGHTHAWK
83-85 CB650SC NIGHTHAWK
82-83 CB750SC NIGHTHAWK
82-83 VF750C MAGNA
84-86 VF700C MAGNA
82-83 VF750S SABRE
84-85 VF700S SABRE
85-86 VT1100C SHADOW
86-87 CMX450C REBEL
************
My setup is working out so far
79 CM400T (bike/fork slider)
85 VT1100C (carry bracket & caliper)
85 VF700C MAGNA (caliper in better condition)
[attachment=1:romnh8ii]image.jpg[/attachment:romnh8ii]
Haven't verified rotors yet, but a match to caliper may be in order...