You will also need a pair of front barrel bearing and booster to complete the look. I take it these are for Holy Roller if so I salute the attention to missing details being squared away. Marstar has the barrel bearings and maybe they could source the jackets from the UK or post a WTB on Milsurps EE / CGN. Both MG parts would be very easy to fabricate and repop in any half ways decent shop.
https://marstar.ca/product/booster-cone-30-06/