rover engine part numbers

hi can any one help ,ive just pulled the big ends and mains from my 1971 2.25 diesel ,ive had my monies worth from them (through to copper)it was knocking a bit .the crank seems fine (no deep scores)but the part numbers on the original shells dont match what everyone is selling no rtc number .on the mains ive got stamped Rover 516815 & NB 29 SB. And on the big ends ive got Rover 527172 NB E44 ZK i need to find out if these are standards or if ifs had a regrind at some time any help would be apppreciated cheers

std size ,youd need rtc1729 main brg set and rtc1730 big end set