I replaced all three mounts on my valver not that long ago. Stupidly ordered them from Reno dealer on impulse. From Renno all three together were £155 +VAT, but I know they can be had cheaper from elsewhere. The drivers side top mount is a reno only part and you will probably have to visit a dealer for that, It is £68 + VAT if i recall correctly. . The other two can be had by phoning Andyspares or visiting your local motor factors. The dogbone can be had for under £20, so can the gearbox one for not a lot more. So you are probably looking at £100 all up for the gearbox mount and the engine mount. Getting the uprated dogbone is a good idea as i think the standard mounts are not the greatest, even when new.
Are uprated mounts, other than dogbone, available anywhere, perhaps competition ones, they must exist, cause I cant see the standard ones being fit for competition of any type.
Alex M