This is the sizes of the factory wheels that VW offered...Maths says maybe need up to a 10mm spacer.
This calculator is pretty helpful.
Golf MK2
Steel
5.0x13 ET45 4/100 13"
5.0x13 ET38 4/100 13"
5.5x13 ET38 4/100 13"
6.0x14 ET38 4/100 14"
6.0x15 ET35 4/100 15" Winter
3.5x14 ET45 4/100 14" Temp
3.5x15 ET40 4/100 15" Temp
Alloy
5.0x13 ET45 4/100 Golf Winter
5.5x13 ET38 4/100 Golf Winter
5.5x13 ET38 4/100 Jetta Winter
5.5x13 ET38 4/100 Hockenheim
5.5x13 ET38 4/100 Unknown
5.5x13 ET38 4/100 Jetta Beach
6.0x14 ET38 4/100 Avus
6.0x14 ET38 4/100 Pirelli
6.0x14 ET38 4/100 Montreal
6.0x14 ET38 4/100 Le Casellet
6.0x14 ET38 4/100 Silverstone
6.0x14 ET38 4/100 Zandvoort
6.0x15 ET35 4/100 Sebring
6.0x15 ET35 4/100 Estoril
6.0x15 ET35 4/100 BBS
6.5x15 ET33 4/100 BBS
6.5x15 ET33 4/100 BBS Splits