During a recent move a friend lost the bottom mounting rails for the roll-up side glass in the MGA Coupe. Since new parts are not available and good used parts are scarce as hens teeth, you can adapted MGB parts. The MGB parts are 18-1/2 inches long where the MGA parts are 15-1/2 inches long (or a bit less). Solution is to cut 1-1/2 inches off each end of the MGB parts to make them work for the MGA.