XV Motorsports seatbelts

OK guys, I just fabbed and installed the anchor points for shoulder belts in my 67 notch.
I had the headlinner out anyway.
Before I order the Wesco belts I have a couple of questions...
Do the retracters interfear with front seat travel ?
Did you need the additional sleeves to hold the belt ends up/out ?
I have buckets and the current front belts have sleeves I might could reuse.
Should I buy sleeves for the rear non retractable lap belts female end ? Yes I want a complete 4 person set.
Lastly and most importantly, Have you had any issues such as buckle failures or reel failures ?

By the way , If anyone needs more info about anchors for shoulder belts in their 67, just ask. FABO rocks :)