compare part nos on 9" servo

Hi.
Started gathering the parts for the large servo/master cylinder upgrade.everyone seems to talk of the mk2 16v servo/mastercyl.
Anyhow ive noticed the servo on my clipper 1.8 carb already has a 9" servo.Is this standard?
Also in possesion of another 9" servo with a slightly diff part number 172 612 105k and 172 612 105j.(why different?)
I guess i want to know is the much talked of mk2 16v servo any different I know diameter is the same just wondered if there was any difference internally.
WILL THE 22MM MASTER CYLINDER IVE ORDERED FIT EITHER OF THE 9" SERVO I HAVE OR WILL I NEED THE MK2 16V SERVO
looking through the technical sect there doesnt seem to be any mention of using these 9" servo which need no cutting of 10mm thread end at clevis pin section.
ANY HELP APPRECIATED
Bobby

bump?
can someone please check the part numbers above.tried the vagparts website saying not found.
also starting to wonder are they 8" servos ive got.
when i measure the overall diameter it does look to be 9"
however they do tend to narrow towards the front and measure around 8.25 inch.
any help with the above post appreciated as well.

i personally use the citigolf 9 inch servo,they bolt straight on,and the 22.2mm g60 master bolts on with no mods at all,ive done this to my TD and it stops very well with standard gti calipers.
Bert

thanks for your reply bert.
do you know the part numbers in the first post.
ive ordered the 22mm master cylinder and picked up what i measured as 9" servo but starting to doubt where i should
be measuring.am i sounding stupid?

bobby

there was a 7 8 and 9 inch servo used on mk1's as i recall,im not sure what your part numbers are from to be honest,the citigolf one i found was perfect with no mods at all,
Bert

172 612 105j ive got one of these in the garage,its off a k plate sciroco 1.8 i cut up many years ago,i think it was a gt2 car,ive thrown the master so dont know what it had on it bore size  
Bert

was the scirroco 1.8 a 9" servo.feel rather stupid here as ive servo infront of me.back of servo diameter 9" however front of servo nearer 8"
may have to wait for the m/c to arrive and try fitting.
thanks for the help
bobby

9 inch i measure the biggest point  :wink:
Bert