It appears that CRK101 vs CRK115 is a different angle jet to suit the fuel bowl angle
Website
https://classiccarpa...rettors-crk-115
“ S.U Genuine HS2 Rebuild Kit - For a Pair of HS2 Carburettors CRK 115
This Kit suits Carbs where the Carb and Float Chamber are installed vertically.
Twin carbs by their application must be pretty close to the same to operate as well as they should.
Most of us have done a quick rebuild (replaced gaskets, etc.) on our carbs over the years.
If you have never done your throttle shafts, jets, etc- it is probably past due!
This is the Full Kit to rebuild both Carburettors on your Car
CRK 115 contains a pair of AUD 9103 and AUD 9104 jets which are left and right handed jets for use with
float chambers which are not angled back.
(CRK 101 contains a pair of AUD 9141 and AUD 9142 jets which are left and right handed jets for use with float chambers angled back at 20 degrees.)
This kit contains 42 pieces.
The Butterfly's as well as Spindles and new Spindle Bushes are included
Rebuild Kit - For a pair of HS2 Carburettors .
Includes a full set of Gaskets and Seals, Main Jets, Needle Valve and seat for the Float Bowl, Spindle and Bushes, Throttle Disc and Screws.
Note the main-jet size in this kit is rated at 0.090". That would be the standard for your car.
A comprehensive manual is also included
Note the Needle valve seats are Viton tipped which makes them safe for Ethanol Fuels.
Carburettor repair kit. CRK 115
Repair kit with parts to do front and rear HS2 Carbs
This is the Genuine SU Repair kit
As found on many Classic Cars of the period that have veritcal mounted SU carbs and Float Bowls including ;
Triumph Spitfire Mk1
Triumph Spitfire Mk2
Triumph Spitfire Mk3
and many variations of the type.
Alternate Part numbers:
CRK115
CRK101”
