Shock absorber for a '89 PX

Hello,

I'm looking for a Shock absorber kit (front & rear) for my Vespa px from '89.

What do you think of the sebac product quality/price ?
http://www.sip-scootershop.com/pages/details.php?ID=18751&SID=8ae009fe903c3ebebd45adf4be6f5d98

Regards