are 1986/87 5ktq brakes really different from other years?

[auditude at cox.net]

Huh?  Wow.  This is very interesting, as my MC-1 donor 5kt has G54's on it, which are the same as the
o.g. brakes on my Type 85's.

This makes me wonder about the 5kt caliper brackets.  Do the G54 and G60 interface the same with the
caliper bracket?  That doesn't make sense, because ppl with Type 85's typically have to swap to 80/90
style front strut housings to get the G60's on, I believe.

Or, perhaps there's something special about the 5k brackets versus the 4k bracket, and it can accept
either caliper.  What gives?

There's another question below too.

TM t44tq at mindspring.com wrote:
>
> About the G54 -> G60 conversion on 5ktq once again:
>
> When I upgraded the brakes, all I did was the following:
>
> 1. Remove old calipers, brake lines, rotors and pads
> 2. Install new rubber brake lines, rotors, pads in calipers and bolt
> on G60 calipers onto existing caliper mounts (carriers).
>
> Very easy, unlike mounting S8 rear rotors, which I think will
> require S8 rear caliper carriers and rotors at the minimum.
>
> Taka


TM t44tq at mindspring.com wrote:
>
> Stephane-
> BTDT- I converted my early 5ktq to the G60 calipers, changing rotors
> and pads (mandatory) at the same time, with new OEM rubber lines as
> well.
>
> Big improvement in braking, absolutely worth it. It's totally bolt-on,
> you'll need calipers, lines, rotors and pads to do this. The lines I'm
> not 100% sure if they need changing, but I do know there are two
> different part numbers depending on the brake setup, so keep that in
> mind.
>
> Easy way to tell- pull off a front wheel and look on the outside "top"
> of the caliper- if it says G54, you have the earlier single piston
> brakes; if it says G60, you already have the twin-piston brakes and
> can't upgrade further w/ OEM parts, excepting the use of an RS2
> caliper bracket and the fitment of Porsche 993 turbo calipers,
> although that would mandate a minimum of 16" wheels, new rotors,
> lines, etc. to the tune of $1200+ at a minimum just for the brake
> components.
>
> Taka

Going the RS2 caliper brackets and 993tt caliper route, what rotors or rotor hats are usable to complete
this swap?

Thanks,

Ken, not knowing whether to leave the subject line the same or change it...