I have a working ABS pump in the garage, from my old Mk3 Golf 1H2 614 217 A
Removed as the car was worth more in bits than as a whole. ABS module is available too.
This was from a 16V fitted with EDL differential lock, so it's not exclusive to VR6 vehicles.
They get 1x standard car in, make a custom exhaust, then make a jig from that exhaust, then enter the details into a job card & there is your mass produced system.
This is great if your car is 100% standard. If you have a lowered car then the clearance between rear beam and exhaust does not match the exhaust made for the jig. This is the same for other modifications e.g. you run an additional ARB or an engine conversion.
This isn't saying that these systems won't fit, but they weren't designed to work with other modifcations.
^ pretty much standard vehicle by looks of things
Custom fit should beat mass produced fit everytime.
I have a Longlife by PowerSpeed & the fit is superb. Jetex was a nightmare fitment wise & cutting the 2.5" pipe off revealed... 2" box
So basically their 2.5" system uses same boxes as 2" system.
^ this is Golf Mk2 btw
May be too late to be of use to you but...
Gbox codes DUU, DUW, ERT, DLP should be ok.
Engine codes that match to these are: AKL, AHW, BCA, AEH, AZD, AXP, AUS, APE.
Your 1.6l will be one of the above ^
I have for sale an Ate ABS Pump for Corrado & early Golf Mk3
Part number: 1H2 614 217 A
This is found on vehicles with the EDL
(early form of traction control iirc)
This is not easy to find these days, & this one is in good working order.
There is one listed as in stock in VW at around £2000.
Price: £50 collected, postage would be extra.
Location: Basildon, Essex.
PM or email to ABF16V at gmail dot com