Made my own with a period leather luggage strap. padded the rear with the soft part of a velcro strip. added morgan logo /badge under £20 and has the required "patina"
Not a bad idea, may have a look out.
"Y mae dafad ddu ym mhob praidd" 1972 4/4, 1981 MGBGT, 1984 FLHT1340, 1980 XLH1000, 1990 ZX10