Piston Ring Compressor Renault 5 GT Turbo PhaseII

[phase i 16 v turbo]

Hi, I have lost my old one so time to buy a new one, but can't remember is the size. I would like to replace it before removing the head.

They following sizes are available

Capacity Depth
45 – 75mm 50mm
60 – 100mm 75mm
75 – 140mm 75mm
70 – 150mm 100mm

Which one do I need for the job?
Many thanks in advance!

[raj]

std piston diameter is 76mm. i use one this size (http://cgi.ebay.co.uk/3-PISTON-RING-COMPRESSOR-car-repair-tool-54-127mm_W0QQitemZ400022574536QQcmdZViewItemQQptZUK_R ecovery_Tools?hash=item400022574536&_trksid=p3286.c0.m14&_trkparms=66%3A4%7C65%3A2%7C39%3A1%7C240%3A1318)

[phase i 16 v turbo]

std piston diameter is 76mm. i use one this size (http://cgi.ebay.co.uk/3-PISTON-RING-COMPRESSOR-car-repair-tool-54-127mm_W0QQitemZ400022574536QQcmdZViewItemQQptZUK_R ecovery_Tools?hash=item400022574536&_trksid=p3286.c0.m14&_trkparms=66%3A4%7C65%3A2%7C39%3A1%7C240%3A1318)
Many thanks! I will order one tonight.

Cheers
Mike