1991 XJS Convertible brake problem

My Lumped 1991 XJS is at a shop for a brake problem - pedal goes all the way to the floor. I’ve had over 8000 miles on the Chevy 350 since 2007. According the mechanic, the brake cylinder unit need to be replaced. Can you please suggest where I can buy it used or brand new? Looks like the part number is 10.2125-0105.9 Thank you.

The part number is JLM1475 as per a search at www.jaguarlandroverclassic.com but not in stock - you might try other suppliers - Tex.

good looking lump! looks to be lowered a bit

The after market wheels and tires are the culprit, larger than the original. When I get some money I will them replaced w/lower profile versions. :call_me_hand: